Answer:
b,c,f
Step-by-step explanation:
Can somebody help me with grade7math!!!! Anybody who’s done this before or remembers how!! Answer all these correct :3
(Will mark brainliest)
Answer:
13) First blank: 2 Second blank: 5
14) First blank: 7 Second blank: 5
15) First blank: -11 Second blank: -2
16) First blank: 4 Second blank: 3
17) First blank: -3 Second blank: -8
18) First blank: -2 Second blank:6
general term for -13, -11, -9, -7
The general term for the arithmetic sequence; -13, -11, -9, -7 is Tn = -15 - 2n.
Arithmetic progression-13, -11, -9, -7
First term, a = -13Second term = -11Common difference, d = Second term - first term
= -11 - (-13)
= -11 + 13
= 2
Therefore,
Tn = a + (n - 1)d
Where,
n = number of termsTn = a + (n - 1)d
= -13 + (n - 1)2
= -13 - 2n - 2
Tn = -15 - 2n
So therefore, the general term for the arithmetic sequence; -13, -11, -9, -7 is Tn = -15 - 2n.
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the average person's heart beats about 4,200 times in 1 hour. Write and solve an equation to find about how many times that is per minute
The population P of a city (in thousands) can be modeled by P = 210(1.138)ᵗ where t is time in years since July 1, 2006. The population on July 1, 2006 was ___
The population on July 1, 2007 was: ___
The annual growth factor is ___
The annual growth rate is ___ %
The annual growth rate of the city's population is 13.8%. The population of a city can be modeled using the equation P = 210(1.138)ᵗ, where P is the population in thousands and t is the time in years since July 1, 2006.
To determine the population on specific dates, we can substitute the values of t into the equation. Additionally, we can calculate the annual growth factor and growth rate using the given equation.
The equation P = 210(1.138)ᵗ represents the population of a city as a function of time since July 1, 2006. To find the population on a specific date, we need to substitute the corresponding value of t into the equation. For example, if we want to determine the population on July 1, 2006, we set t = 0 since it is the reference point. Thus, the population on that date is:
P = 210(1.138)⁰
P = 210
Therefore, the population on July 1, 2006, was 210,000 (since P is given in thousands).
To find the population on July 1, 2007, we set t = 1 since it represents one year after the reference point:
P = 210(1.138)¹
P ≈ 239.58
Hence, the population on July 1, 2007, was approximately 239,580.
The annual growth factor in this case is the value inside the parentheses, which is 1.138. It indicates the rate at which the population grows each year.
The annual growth rate can be calculated using the formula: growth rate = (growth factor - 1) * 100%. In this case, the growth rate is approximately (1.138 - 1) * 100% = 13.8%. Therefore, the annual growth rate of the city's population is 13.8%.
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The illustration below shows the graph of yyy as a function of xxx.
Complete the following sentences based on the graph.
Initially, as xxx increases, yyy
.
Afterward, the slope of the graph of the function is equal to
for all xxx between x=3x=3x, equals, 3 and x=5x=5x, equals, 5.
The slope of the graph is equal to
for xxx between x=5x=5x, equals, 5 and x=9x=9x, equals, 9.
The greatest value of yyy is y=\:y=y, equals
, and it occurs when x=\:x=x, equals
.
answer in the picture
Answer:
The illustration below shows the graph of yyy as a function of xxx.
Complete the following sentences based on the graph.
Initially, as xxx increases, yyy
Step-by-step explanation:
Describe the shape of the distribution.
A. It is symmetric.
B. It is uniform.
C. It is bimodal.
D. It is skewed.
given that the probability of a family owning a dog is 0.91, and the probability of a family owning a cat and a dog is 0.15, what is the probability of a family owning a cat given that the family owns a dog?
The probability of a family owning a cat given that the family owns a dog is 0.164
In probability theory, conditional probability is a measure of the probability of an event occurring, given that another event has already occurred.
Here
probability of a family owning a dog is 0.91,
P(dog) = 0.91
probability of a family owning a cat and a dog is 0.15,
P(dog ∩ cat) = 0.15
according to conditional probability
the probability of occurring of B after event A takes place is
P(A|B)=P(A∩B)/P(A)
so, the probability of a family owning a cat given that the family owns a dog is
P(dog | cat) =P(dog∩cat)/P(dog)
= 0.15/0.91
=0.164
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Cam saved $270 each month for the last three years while he was working. Since he has now gone back to school, his income is lower and he cannot continue to save this amount during the time he is studying. He plans to continue with his studies for five years and not withdraw any money from his savings account. Money is worth4.8% compounded monthly.
(a) How much will Cam have in total in his savings account when he finishes his studies?
(b) How much did he contribute?
(c) How much will be interest?
Cam will have approximately $18,034.48 in his savings account when he finishes his studies.
How much will Cam's savings grow to after five years of studying?Explanation:
Cam saved $270 per month for three years while working. Considering that money is worth 4.8% compounded monthly, we can calculate the total amount he will have in his savings account when he finishes his studies.
To find the future value, we can use the formula for compound interest:
FV = PV * (1 + r)^n
Where:
FV is the future value
PV is the present value
r is the interest rate per compounding period
n is the number of compounding periods
In this case, Cam saved $270 per month for three years, which gives us a present value (PV) of $9,720. The interest rate (r) is 4.8% divided by 12 to get the monthly interest rate of 0.4%, and the number of compounding periods (n) is 5 years multiplied by 12 months, which equals 60.
Plugging these values into the formula, we get:
FV = $9,720 * (1 + 0.004)^60
≈ $18,034.48
Therefore, Cam will have approximately $18,034.48 in his savings account when he finishes his studies.
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Which equation represents the graph of y = x² + 2x - 3 moved 3 units to the left?
A. y = x² + 2x - 6
B. y = (x+3)² + 2x - 3
C. y = (x + 3)² + 2(x+3)
D. y = (x+3)² + 2(x+3)-3
Equation A
Equation B
Equation C
Equation D
The equation that represents the graph of y = x² + 2x - 3 moved 3 units to the left is: D. y = (x+3)² + 2(x+3)-3
What is graph equation?
To move a function 3 units to the left, we need to replace x with (x + 3) in the equation. This is because, if we plug in x + 3 into the equation, we will get the same value as if we had plugged in x but moved 3 units to the left.
So, starting with the original equation y = x² + 2x - 3, we replace x with (x + 3):
y = (x + 3)² + 2(x + 3) - 3
Now, we can simplify this equation to get it into standard form:
y = x² + 8x + 18
Therefore, the equation that represents the graph of y = x² + 2x - 3 moved 3 units to the left is:
D. y = (x+3)² + 2(x+3)-3
which simplifies to:
y = x² + 8x + 18.
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King Leopold became the monarch of which European country in 1865?
Answer:
King Leopold became the monarch of Belgium in 1865
Suppose that the average cost, in dollars, of producing a shipment of a certain product is C = 5,000x + 20,000/x, x > 0 where x is the number of machines used in the production process. (a) Find the critical values of this function. (Assume 0 < x < [infinity]. Enter your answers as a comma-separated list.) x = Incorrect: Your answer is incorrect. (b) Over what interval does the average cost decrease? (Enter your answer using interval notation.) (c) Over what interval does the average cost increase? (Enter your answer using interval notation.)
The average cost function is C(x) = 5000x + 20,000/x, where x is the number of machines used in the production. The critical value is C(x) = 20,000 and it happens when x = 2.
If we have a function f(x), the critical point happens when its first derivative is equal to zero.
f '(x) = 0
In the given problem, the function is:
C(x) = 5000x + 20,000/x
Take the derivative:
C '(x) = 5000 - 20,000/x² = 0
5000 x² = 20,000
x² = 4
x = ±2
Since x is within the interval: 0<x<∞, the solution is x = 2
Substitute x = 2 into the function:
C(2) = 5000 (2) + 20000/2
C(2) = 10000 + 10000 = 20,000
Hence, the critical value is C(x) = 20,000 and it happens when x = 2.
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Find the Unit Price for each bottle of conditioner. Which bottle of hair conditioner is the best buy?
8 oz for $1.49
12 oz for $2.29
15 oz for $2.75
20 oz for $3.89
Answer:
D.
Step-by-step explanation:
We know that to find unit price, we divide the unit in the numerator by the quantity in the denominator.
For the first option, we must put $1.49 as the numerator and 8 as the denominator. It will then look like this:
\(\frac{1.49 / 8 }{8 / 8\\}\) Then we must divide 1.49 by 8. This will get us $0.18625.For our second option, we must put $2.29 as the numerator, and 12 as the denominator. It will look like this:
\(\frac{2.29 / 12 }{12 / 12\\}\) Then we must divide 2.29 by 12. This will get us $0.19083 (rounded)For our third option, we must put $2.75 as the numerator, and 15 as the denominator. It will look like this:
\(\frac{2.75 / 15 }{15 / 15}\)Then we must divide 2.75 by 15. This will get us $\(0.18333\) (rounded)For our final option, we must put $3.89 as the numerator, and 20 as the denominator. It will look like this:
\(\frac{3.89 / 20 }{3.89 / 20}\)Then we must divide 3.89 by 20. This will get us $0.1945 (rounded)Therefore, the last option is the best buy because $0.18625 > $0.18333.
factorise 16 x²+ 4 y² + 9 z²
Answer:
The expression is not factorable with rational numbers.
Step-by-step explanation:
Assume that each year the IRS randomly audits 20% of the tax returns. If a married couple has filed separate returns, answer the following questions. (a) What is the probability that both the husband and the wife will be audited? (b) What is the probability that only one of them will be audited? (c) What is the probability that neither one of them will be audited? (d) What is the probability that at least one of them will be audited?
This problem concerns probability and assumes that the IRS randomly audits a fraction of tax returns each year. The query is about a married couple that filed separate returns, and it wants to know how likely it is that both will be audited, just one will be audited, neither will be audited, and at least one will be audited. The problem assumes that the percentage of audited tax returns is set at 20%.
(a) The probability that both the husband and wife will be audited is equal to the product of the individual probabilities:
P(both audited) = 0.2 * 0.2 = 0.04
(b) The probability that only one of them will be audited is the sum of the probabilities that the husband is audited and the wife is not, and vice versa:
P(only one audited) = 0.2 * 0.8 + 0.8 * 0.2 = 0.32
(c) The probability that neither one of them will be audited is the complement of the probability that at least one of them will be audited:
P(neither audited) = 1 - P(at least one audited) = 1 - (0.2 * 0.8 + 0.8 * 0.2 + 0.2 * 0.2) = 0.36
(d) The probability that at least one of them will be audited is equal to one minus the probability that neither of them will be audited:
P(at least one audited) = 1 - P(neither audited) = 1 - 0.36 = 0.64
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The table shows the proportional relationship between the price for a certain number of buckets of golf balls at a driving range.
Buckets 3 5 7
Price (dollars) 28. 50 47. 50 66. 50
Determine the constant of proportionality.
9. 5
10. 5
18. 25
28. 5
The constant of proportionality is 9.5.
The correct option is (a)
Given,
In the question:
The proportional relationship between the price for a certain number of buckets of golf balls at a driving range.
Buckets 3 5 7
Price (dollars) 28. 50 47. 50 66. 50
To determine the constant of proportionality.
Now, According to the question:
We know that:
Proportional relationship equation:
y = kx, where k-constant of proportionality
In the given table, number of buckets represent input values (x) and the price represents output values (y).
We have for the first column:
x = 3, y = 28.50
Find the value of k by plugging in the values of x and y:
28.50 = 3k
k = 28.50/3
k = 9.5
The options are:
a) 9. 5
b) 10. 5
c) 18. 25
d) 28. 5
Hence, The constant of proportionality is 9.5.
So, The correct option is (a).
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select all the expressions equivalent to 5x + 6x + 3x : 11x + 3x, 14x + x, 2 (3x + 4x), 3x(2 + 1) + 5x, 5x + 3(2x + x)
Step-by-step explanation:
5x + 6x + 3x
= 14x.
Now we compare the expressions with the result:
11x + 3x = 14x. (correct)
14x + x = 15x. (incorrect)
2(3x + 4x) = 2(7x) = 14x. (correct)
3x(2 + 1) + 5x = 3x(3) + 5x = 9x + 5x = 14x. (correct)
5x + 3(2x + x) = 5x + 3(3x) = 5x + 9x = 14x. (correct)
Hence our answers are the 1st, 3rd, 4th and 5th.
An empty container weighs 20 g. A wet soil sample is put in the container and together they weigh 151 grams. The container containing the wet soil sample is dried in an oven and then weighed again. The dry soil and the container weigh 120 grams. Calculate the moisture content of this soil. Show your calculations and provide the appropriate units.
The calculation can be concluded that the moisture content of the soil is 31%.
Moisture content of the soil is calculated using the formula:
MC = (Wet weight - Dry weight) / Dry weight
Therefore, the first step to calculating moisture content is to determine the wet weight of the soil.
Wet weight of soil and container = 151 g
Weight of empty container = 20 g
Weight of wet soil = 151 g - 20 g = 131 g
Next, the dry weight of the soil needs to be determined.
Dry weight of soil and container = 120 g
Weight of empty container = 20 g
Weight of dry soil = 120 g - 20 g = 100 g
Now that both the wet weight and dry weight have been determined, the moisture content can be calculated:
MC = (Wet weight - Dry weight) / Dry weight
MC = (131 g - 100 g) / 100 g
MC = 31 g / 100 g
The moisture content of the soil is 0.31 or 31%.
This can be written as 31/100 or as a percentage.
The final answer should be rounded off to the nearest hundredth place or two decimal places.
Therefore, the answer is:
Moisture content of the soil = 31 % or 0.31
Therefore, the calculation can be concluded that the moisture content of the soil is 31%.
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4. 2. 4Practice:Modeling: Slope-Intercept Equation of a Line
The slope-intercept form of the equation of a line is: y = mx + b
Where: y is the dependent variable (usually represented on the vertical axis of a graph). x is the independent variable (usually represented on the horizontal axis of a graph). m is the slope of the line (which represents the rate of change of y with respect to x). b is the y-intercept (which represents the value of y when x is equal to 0). To use this equation, you need to know the slope (m) and the y-intercept (b) of the line. You can find the slope of a line by taking any two points on the line and using the formula:
m = (y2 - y1) / (x2 - x1)
where (x1, y1) and (x2, y2) are any two points on the line. Once you know the slope, you can substitute it and the y-intercept into the slope-intercept form of the equation of the line to get the equation in its final form.
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WILL GIVE BRAINLIEST, THANKS AND 5 STARS.
Sam kicks a ball off of a rooftop. After t seconds, its height, h (in feet), is given by the formula: h (t) = -16t^2 + 64t + 80.
*NOTE: Complete this without using graphing features on your calculator, and show all work for credit.
a. What is the maximum height reached by the ball?
b. When did the ball reach its maximum height?
c. When will the ball hit the ground? (Do algebraically)
d. What is the height of the ball after 1 second?
EXPLAIN ALL 4 PARTS IN DEPTH, PLEASE!
hi hope this is what you were looking for, hope this helps.
Answer:
a. 144m
b. After 2 secs
c. Ball hits the ground after 5 secs.
d. 128m
Step-by-step explanation:
A To find max height, find derivative of equation, let it equal zero, and sub in value into original equation: h(t) = -16t² + 64t + 80 h'(t)=-32t+64 -32t+64=0 32t=64 t=2 h(2) = -16(2²) + 64(2) + 80 h(2) = -64+128+80 = 144m B When h=144, t=2. Therefore, the ball reaches its max height after 2 secs. C When the ball hits the ground, h=0: -16t² + 64t + 80=0 t²-4t-5=0 (simplified) (t-5)(t+1)=0 t=5 and t=-1 Discount t=-1 (time cant be neg). Ball hits the ground after 5 secs. D Find h when t=1: h(t) = -16t² + 64t + 80 h(1) = -16(1²) + 64(1) + 80 h(1) = -16+64+80 h(1) = 128m.
Please Answer
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Part A: Which measurements do you need to know to find the volume of a cylinder?
Part B: Since the base of the refraction cup is a half circle, how can you find the radius? What is the radius?
Part C: If you put two refraction cups together, what three dimensional shape would you have?
Part D: The formula for the volume of a cylinder is V=pi r^2 h. What is the approximate volume of two refraction cups? Use 3.14 for pi.
Part E: Since one refraction cup is half of a cylinder, how could you change the formula for the volume of a cylinder to calculate the volume of a refraction cup?
Part F:Using the equation from Part E, what is the approximate volume of one refraction cup? What is the relationship between this value and the value from Part D? Use 3.14 for pi.
Answer:
Either circle will do since they are the same size. If you already know the radius, you can move on. If you don't know the radius, then you can use a ruler to measure the widest part of the circle and then divide it by 2. This will be more accurate than trying to measure half of the diameter. Let's say that the radius of this cylinder is 1 inch (2.5 cm). Write it down.
Step-by-step explanation:
The relationship would be the volume of a cylinder is 3 times the volume of a refraction cup.
What is the cylindrical shape?A cylindrical shape is a three-dimensional geometrical shape consisting of two parallel circular bases which are connected by some height h.
Part A: To find the volume of a cylinder, we need the dimensions of the cylinder such as the radius of the base of the cylinder and the height of the cylinder.
Part B: We have given the base of the refraction cup as a half-circle, we can calculate the radius of the base.
The diameter is given as 8 cm so, the radius would be half of the diameter.
r = 4cm
Part C: If you put two refraction cups together, we get the full three-dimensional shape that is a circle.
Part D: The formula for the volume of a cylinder is V=pi r^2 h.
\(V=\pi r^2 h\\V=3.14\times4^2\times 2\\V = 100.48\)
Part E: The volume of a refraction cup = \(4/3\pi r^{3}\)
= 4/3 (3.14)(8)
= 33.49
Part F: The relationship between the value D and the value from Part D is as follows
The volume of a cylinder = 3 times the volume of a refraction cup
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Listed in the accompanying table are weights (lb) of samples of the contents of cans of regular Coke and Diet Coke. Assume that the two samples are independent simple random samples selected from normally distributed populations. Do not assume that the population standard deviations are equal. Complete parts (a) to (c).
Regular Coke Diet Coke
0.81918 0.77728
0.81502 0.77577
0.81634 0.78963
0.82112 0.78676
0.81811 0.78438
0.82471 0.78607
0.80617 0.78062
0.81280 0.78304
0.81715 0.78520
0.81098 0.78794
0.82510 0.78807
0.82635 0.78261
0.79230
0.78518
0.78719
0.78127
Use a 0.01 significance level to test the claim that the contents of cans of regular Coke have weights with a mean that is greater than the mean for Diet Coke.
Can you explain why cans of regular Coke would weigh more than cans of Diet Coke?
A. Cans of regular Coke probably weigh more than cans of Diet Coke due to the extra metal present in a regular Coke can but not a Diet Coke can.
B. Cans of regular Coke probably weigh more than cans of Diet Coke due to Diet Coke cans being only half as large as regular Coke cans.
C. Cans of regular Coke probably weigh more than cans of Diet Coke due to the sugar present in regular Coke but not Diet Coke.
D. There is no reason why they would have different weights.
(a) We can use a two-sample t-test to test the claim that the contents of cans of regular Coke have weights with a mean that is greater than the mean for Diet Coke.
The null hypothesis is that the mean weight of regular Coke is equal to or less than the mean weight of Diet Coke, while the alternative hypothesis is that the mean weight of regular Coke is greater than the mean weight of Diet Coke. Using a calculator or statistical software, we find that the test statistic is 4.013 and the p-value is 0.0001. Since the p-value is less than the significance level of 0.01, we reject the null hypothesis and conclude that there is sufficient evidence to support the claim that the contents of cans of regular Coke have weights with a mean that is greater than the mean for Diet Coke.
(b) Cans of regular Coke probably weigh more than cans of Diet Coke due to the sugar present in regular Coke but not Diet Coke. Sugar has weight and adds to the overall weight of the can. Diet Coke uses artificial sweeteners instead of sugar, which would result in a lower weight for the can.
Note: The answer choices provided are not accurate as they do not address the actual reason for the weight difference.
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the spanish classes are having a fiesta lunch. each sfudent who attends is to bring a Spanish side dish or dessert. the more students that attend, the more food there will be available.
what is the IV and the DV
Answer:
IV- the amount of students
DV- the amount of dishes
Paisley needs to order some new supplies for the restaurant where she works. The restaurant needs at least 521 spoons. There are currently 225 spoons. If each set on sale contains 15 spoons, which inequality can be used to determine s, the minimum number of sets of spoons Paisley should buy? ○ 15s +225 521 15 +225s 2521 O 158 +225 2 521 O 15 +2258 ≤ 521
Answer:
15s + 225 is less than or equal to 521
Step-by-step explanation:
The restaurant needs 521 spoons and it only has 225.
There is a very simple answer for this.
If each set on sale contains 15 spoons (algorithm rule)
So determine s (15 x s) = 15s (calculation principle)
then 15s + 225 is less than or equal to 521
therefore the result is 15s + 225 is less than or equal to 521 spoons
Solve for L:P = 2L + 2W-OL=P - WOL=-P + 2W2OL=P - wOL = P - W
Given:
\(P=2L+2W\)Required:
We need to solve for L.
Explanation:
Consider the given equation.
\(P=2L+2W\)Subtract 2W from both sides.
\(P-2W=2L+2W-2W\)\(P-2W=2L\)Divide both sides by 2.
\(\frac{P-2W}{2}=\frac{2L}{2}\)\(\frac{P-2W}{2}=L\)\(\frac{P}{2}-\frac{2W}{2}=L\)\(\frac{P}{2}-W=L\)Final answer:
\(L=\frac{1}{2}P-W\)Which of the numbers below is greater than 0.75? Select all that apply.A) 32B) −0.5C) 1.2D) −14E) −2.4
In this case, we'll have to carry out several steps to find the solution.
Step 01:
Data:
0.75
Step 02:
greater than:
greater than 0.75:
Justify each step and simplify the equation.
19+56(1/56)
Answer:
20
Step-by-step explanation:
19 + 56(1/56)
= 19 + 56 x 1/56
= 19 + 1
= 20
100 x 500 x 250 x 600 x 900 x 10 000 x 0 x 500 x 60 x 70 x 50 x 90 + 1 x 50 =
Answer:
50
Step-by-step explanation:
the volume of a large sphere (of radius R) is twice the volume of a smaller sphere (of radius r). form an equation linking r and R.
Step-by-step explanation:
radius of large sphere is R,
then volume is (4/3)*pie*R³
and
the radius of small sphere is r,
then volume is (4/3)*pie*r³
condition is,
volume of larger sphere is twice of the volume of smaller sphere.
then, (4/3)*pie*R³=2*(4/3)*pie*r³;
R³= 2r³
R=(2^⅓)*r
7/8-1/2 it’s a homework question and I can’t get it
Answer:
the answer is 3/8
Step-by-step explanation:
multiply 7 by 2, and get 14
multiply 1 by 8, and get 8
give both terms new denominators which will be 16
The new fraction will be \(\frac{14}{16} - \frac{8}{16}\)
Now you can subtract the numerators which will give you 6/16
Now you would simplify the fraction
Divide the fraction by 2 and you get 3/8 which is your answer
Hope this helps:)
PLEASE HELP, I AM BEING TIMED!!
Assume line M and N are parallel lines cut by transversal L. Find the value of X.
Options: A: X= -0.2
B: X=1.2
C: X=2
D: X=18.2
Answer: C) X=2
Step-by-step explanation: These angles are equal because they alternate exterior angles. Set them equal to each other, and just solve for x.