The acute angle lies between the vectors a=3i+4j and b=7i+j is 45°
Explanation:The given vectors are:
a = 3i + 4j
b = 7i + j
The acute angle between vectors a and and b is given by the formula:
\(\theta=\cos ^{-1}\frac{a.b}{|a\mleft\Vert b\mright|}\)The scalar product of vectors a and b is:
a.b = (3i + 4j).(7i + j)
a.b = (3x7) + (4x1)
a.b = 21 + 4
a.b = 25
The magnitude of a is:
\(\begin{gathered} |a|=\sqrt[]{3^2+4^2} \\ |a|=\sqrt[]{9+16} \\ |a|=\sqrt[]{25} \\ |a|=5 \end{gathered}\)The magnitude of b is:
\(\begin{gathered} |b|=\sqrt[]{7^2+1^2} \\ |b|=\sqrt[]{49+1} \\ |b|=\sqrt[]{50} \\ |b|=5\sqrt[]{2} \end{gathered}\)Substituting the values of a.b, |a|, and |b| into the formula for the acute angle.
\(\begin{gathered} \theta=\cos ^{-1}\frac{a.b}{|a\Vert b|} \\ \theta=\cos ^{-1}\frac{25}{5\times5\sqrt[]{2}} \\ \theta=\cos ^{-1}\frac{25}{25\sqrt[]{2}} \\ \theta=\cos ^{-1}\frac{1}{\sqrt[]{2}} \\ \theta=45^0 \end{gathered}\)Therefore, the acute angle lies between the vectors a=3i+4j and b=7i+j is 45°
You just got your first job and are planning on renting your own apartment. What steps should you follow to help make this process easier?
Answer:
Determine Your Budget.
Check Your Credit.
View Multiple Rentals.
Consider Roommates.
Consider a Cosigner.
Gather Your References.
Check Out the Neighborhood.
Check All the Websites.
The function y = 4x² + 9x-2 has______at the vertex.
A:minimum
B:Maximum
Answer:
A. MinimumStep-by-step explanation:
Given function:
y = 4x² + 9x - 2This is a quadratic function with positive leading coefficient.
It means the graph of the function opens up and therefore it has minimum value of the function at the vertex.
Correct answer choice is A
Is -1.5 a positive number
Answer: no 1.5 in this cawe is a neg number which is why they put a negative sign in the front
In Exercises 25 and 26, write a linear function f with the
given values
The solution is, the 1st linear function => f(x) = -2x+1 and,
the 2nd linear function => f(x) = x/2.
What is function?Function, in mathematics, an expression, rule, or law that defines a relationship between one variable (the independent variable) and another variable.
here, we have,
from the given data, we get,
for the 1st table,
the linear function => f(x) = -2x+1
and,
from the 2nd table,
the linear function => f(x) = x/2
Hence, The solution is, the 1st linear function => f(x) = -2x+1 and,
the 2nd linear function => f(x) = x/2.
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24. Why are alkylating agents not used as antiseptics?
Answer:
Because alkylating agents effectively sterilize materials at low temperatures but are carcinogenic and may also irritate tissue.
Step-by-step explanation:
The last one was a question it meant what times 8=800
Answer:
100
Step-by-step explanation:
8 x 1 = 8
8 x 10 = 80
8 x 100 = 800
Is this what you need? Sorry if its not.
Please look at the pic and help!!
Answer:
4x² + 22x - 12
Step-by-step explanation:
A = bh/2
A = (4x - 2)(2x + 12)/2
A = (8x² + 48x - 4x - 24)/2
A = (8x² + 44x - 24)/2
A = 4x² + 22x - 12
Given: Circle A externally tangent to Circle B.
Co
K
The point of tangency of line s to circle B is,
O point J
point K
gº
Opoint A
O point M
The point of tangency of line s to circle B is, point K and option 2 is the correct answer.
What is tangent line?A straight line that touches a curve only once, without passing over or intersecting it, is said to be tangent to the curve. The limit of the secant lines that pass through a point on a curve is referred to as the tangent line in mathematics. Secant lines are lines that connect two adjacent points on the curve.
The tangent line mathematically indicates the slope or instantaneous rate of change of the curve at that location. The tangent line at a point on the curve shows the object's instantaneous velocity at that location if the curve represents an object's route.
The line s is the tangent to the circle B and it touches the circle at point K.
Hence, the point of tangency of line s to circle B is, point K and option 2 is the correct answer.
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Choose Yes or No to tell whether the fraction and percent are equivalent.
40/1000 and 40%
6/5 and 120%
50/33 and 117%
1/8 and 12.5%
A theater wants to build movable steps that they can use to go on and off the stage. They want the steps to have enough space inside so they can also be used to store props.
The required amount of the space available is 0.045 cubic meter.
We need to determine Space inside the steps.
What is volume?The Volume is defined as the mass of object per unit density.
The required space = 0.3*0.4*0.5 - 0.15*0.5*0.2
= 0.06 - 0.015
= 0.045 cubic meter
Hence, the required amount of the space available will be 0.045 cubic meter.
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A survey asked fans of two teams whether they were more likely to buy tacos or hotdogs at the game. Based on the results of the survey, what is the probability that arandomly selected person who would rather buy tacos is a fan of team A?
Given the following question:
\(\begin{gathered} 30+70+50+50=200 \\ 200\text{ people in total} \\ \text{30 of the 200 people want tacos and are a fan of team A} \\ \frac{30}{200}\div10=\frac{3}{20} \\ =\frac{3}{20} \\ \text{ Out of every 20 people 3 will want tacos while being fans of team A} \end{gathered}\)Your answer is option D.
A company recently downsized its number of employees by 30%. If there are still 84 employees, how many employees were there prior to the layoffs?
Answer:
There were 120 employees prior to the layoffs.
Step-by-step explanation:
x is original amount of employees
0.7x=84
divide by 0.7 both sides
x=120 employees
downsize 30% is 36, 120-36=84
this research seeks to identify, describe and produce an analysis of the factors that influence the learning choices of first- year undergraduate students who intend to go on to postgraduate study when they graduate, and develop associated theory.
The research explores the various factors that may influence the learning choices of first-year undergraduates, such as the family and educational background of the student, their socioeconomic status and the availability of resources, among others.
What is factor?Factor is a mathematical quantity which is multiplied with another quantity to give a product. Factors can also be defined as the numbers that divide a given number exactly. Factors are used in everyday life to calculate many different types of problems, such as compound interest, speed, distance and time, and more. Factors are also used in statistics and probability to determine the likelihood of certain events occurring.
The paper will also examine the various types of postgraduate courses that are available to undergraduates, including those offered by universities and other institutions, such as professional courses or distance learning programmes.
The research adopts a qualitative approach, and will use semi-structured interviews with first-year undergraduates to gain an understanding of their learning choices, and the factors that influence them. Interviews will be conducted with students in different disciplines, in order to gain an insight into how the different disciplines shape students' learning preferences. The research will also use questionnaires to obtain data on the socioeconomic background, family background and educational background of students.
In addition, the research will use documentary analysis of university prospectuses and websites, and information from other sources, such as employers and professional bodies, to gain an understanding of the various postgraduate courses that are available to undergraduates. This data will be used to compare and contrast the learning choices of undergraduates from different disciplines and economic backgrounds.
Finally, the research will use an interpretive approach to analyse the data collected and develop a theory of the factors that influence the learning choices of first-year undergraduates. The theory will be used to inform the design of initiatives to help undergraduates make informed decisions about their learning choices.
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The mean cost of a five pound bag of shrimp is 40 dollars with a standard deviation of 8 dollars.
If a sample of 49 bags of shrimp is randomly selected, what is the probability that the sample mean would be less than 37.4 dollars? Round your answer to four decimal places.
Answer:
The mean of the sample distribution of the sample mean is the same as the population mean, which is 40 dollars. The standard deviation of the sample distribution of the sample mean (also called the standard error) is given by:
standard error = standard deviation / sqrt(sample size) = 8 / sqrt(49) = 8 / 7
To find the probability that the sample mean would be less than 37.4 dollars, we need to standardize the sample mean using the standard error and then look up the probability from a standard normal distribution table. The z-score for a sample mean of 37.4 dollars is:
z = (37.4 - 40) / (8 / 7) = -1.225
Looking up this z-score in a standard normal distribution table, we find that the probability of getting a sample mean less than 37.4 dollars is 0.1103 (rounded to four decimal places). Therefore, the probability that the sample mean would be less than 37.4 dollars is 0.1103.
give thanks, your welcome <3
Step-by-step explanation:
mations to Determine Similarity
What steps would you take to determine if these
figures are similar? Check all that apply.
Use a scale factor of 2.
Multiply the vertices of polygon ABCD by
O Translate the intermediate image 4 units down.
Perform two different dilations.
Reflect the intermediate image.
The steps which you would take to determine if these figures are similar include the following:
2. Multiply the vertices of polygon ABCD by 1/2.
5. Reflect the intermediate image.
What is a dilation?In Mathematics and Geometry, a dilation is a type of transformation which typically transforms the dimension (size) or side lengths of a geometric object, without affecting its shape.
Therefore, the dimension or side lengths of the dilated geometric object would be stretched or compressed (shrunk) depending on the scale factor that is applied.
By critically observing the graph representing polygon ABCD, we can logically deduce that a sequence of transformations that would polygon ABCD (pre-image) onto polygon A"B"C"D" (image) is a dilation by a scale factor of 1/2 and a reflection of intermediate image.
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Missing information:
The question is incomplete and the complete question is shown in the attached picture.
According to a disease control center, 26% of people in a certain country have high blood pressure. If a person in this country is selected at random, determine the odds in favor of this person having high blood pressure.
Answer:
Squirrel has High BLood pressure
Step-by-step explanation:
Squirrels
Write each of these as one-place decimals.
A. 0.30________
B. 0.90________
Answer:
A. 0.3
B. 0.9
By converting these to their tenth form, we can get 1 place decimals
Step-by-step explanation:
A=0.3 answer of a
B=0.9 answer of b
A map has a scale of 1 inch:18 km, three distances on the map are listed in the chart below drag an actual distance into each box to match the corresponding distance on the map
Answer:
A map has a scale of 1 inch:18 km, three distances on the map are listed in the chart below drag an actual distance into each box to match the corresponding distance on the map
Step-by-step explanation:
1-18
what are the x intercepts of y=4x^2-12x+4
The x-intercepts of the given equation 4x^2-12x+4 is -3/2
What is Quadratic equation ?
Quadratic equation can be defined as the equation in which it is in the form of ax^2+bx+c = 0
where c is a constant.
Given equation ,
y = 4x^2+12x+4
so we have to find the x-intercept , make y = 0
and we have to solve for the given quadratic equation
so,
we get
4x^2+12x+4 = 0
(2x)^2 + 9 + 12x = 0
(2x+3)^2 = 0
x = -3/2
There is double root unique intercept or tangent at x = -3/2
Therefore, The x-intercepts of the given equation 4x^2-12x+4 is -3/2
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Find the measure of the missing angles. One of them is wrong I’m not sure which one. (Picture included)
bruhh im having the same fking problems like jesus christ!!!!
Find a 3rd degree polynomial function with real coefficients satisfying the given condition. 2 and -3 +3i are zeros; leading coefficients is 1
A 3rd degree polynomial function with real coefficients satisfying the given condition. 2 and -3 +3i are zeros; leading coefficients is 1, is:
f(x) = x³ + 4x² + 6x - 36
What is polynomial function?An expression that consists of variables, constants, and exponents that is combined using mathematical operations like addition, subtraction, multiplication, and division is referred to as a polynomial (No division operation by a variable).
A polynomial function is one that uses only non-negative integer powers or positive number coefficients of such a variables in such an expression like the quadratic function, cubic equation, and so on.
we have to find third degree polynomial, so, n = 3
Since 2 is its zero ,so, x - 2 is its factor
As complex zeros occur in conjugate pairs .
So,other factors are (x + (3 + 3i)) and (x + (3 - 3i)) ,
Firstly, we find the product of these two factors:
= x² + 6x + 9 - 9i²
= x² +6x +9 - 9(-1)
= (x² +6x + 18)
Now multiply (x² +6x + 18) with (x - 2) we get f(x):
= (x² +6x + 18) (x - 2)
= x³ - 2x² + 6x² - 12x + 18x - 36
= x³ + 4x² + 6x - 36
Correct option: b
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Suppose that $7500 is placed in an account that pays 6% interest compounded each year.
Assume that no withdrawals are made from the account.
Follow the instructions below. Do not do any rounding.
(a) Find the amount in the account at the end of 1 year.
(b) Find the amount in the account at the end of 2 years
a) The compounded amount in the account at the end of 1 year is $7,950.
b) The compounded amount in the account at the end of 2 years is $8,427.
What is compound interest?Compound interest is the interest added to the principal amount after each period in order to compute the period's interest.
By compounding, we mean that accumulated interest is added to the principal to compute the subsequent interest.
Compound interest is unlike simple interest, which does not compound interest.
The compound interest formula is:
A = P(1 + r/n)^nt
A = Final amount
P = initial principal balance
r = interest rate
n = number of times interest is applied per time period
t = number of time periods elapsed
Since this investment is compounding annually, we can find the final amount at the end of each year using the common formula as follows:
A = P(1 + r)ⁿ
Principal = $7,500
Compound interest rate = 6%
Compounding period = Annually
Amount at the end of Year 1 = $7,950 ($7,500 x 1.06¹)
Amount at the end of Year 2 = $8,427 ($7,500 x 1.06²)
Thus, the compounded amount at the end of year 1 is $7,950 and $8,427 at the end of year 2.
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Mrs. Aldridge spilled coffee on her Answer Key and can't see the width of
the rectangle anymore. What would be the width of a rectangle with the
given area (shown in image below)?
x +9
x² + 11x + 18
(My answer is a guess so please show your work if you answer this question!)
thank you:)
Answer:
x + 2
Step-by-step explanation:
Area = x² + 11x + 18
length = x + 9
width = ?
Area = length x width
Factor the polynomial x² + 11x + 18:
length x width = (x + 9)(x + 2) = x² + 11x + 18
The length is x + 9, therefore the width is x + 2
Write an equation that represents the line. Use exact numbers.
Answer:
y = \(\frac{3}{4}\) x - \(\frac{9}{2}\)
Step-by-step explanation:
the equation of a line in slope- intercept form is
y = mx + c ( m is the slope and c the y- intercept )
calculate m using the slope formula
m = \(\frac{y_{2}-y_{1} }{x_{2}-x_{1} }\)
with (x₁, y₁ ) = (- 2, - 6) and (x₂, y₂ ) = (2, - 3) ← 2 points on the line
m = \(\frac{-3-(-6)}{2-(-2)}\) = \(\frac{-3+6}{2+2}\) = \(\frac{3}{4}\) , then
y = \(\frac{3}{4}\) x + c ← is the partial equation
to find c substitute either of the 2 points into the partial equation
using (2, - 3 )
- 3 = \(\frac{3}{4}\) (2) + c = \(\frac{3}{2}\) + c ( subtract \(\frac{3}{2}\) from both sides )
- 3 - \(\frac{3}{2}\) + c , then
c = - \(\frac{9}{2}\)
y = \(\frac{3}{4}\) x - \(\frac{9}{2}\) ← equation of line
A cow is tethered to one corner of a square barn, 8 feet by 8 feet, with a rope 130 feet long. What is the maximum grazing area for the cow?
The maximum grazing area for the cow is approximately 53,343.08 square feet.
How to Find the maximum Grazing Area?The maximum grazing area for the cow can be found by imagining a circle with radius equal to the length of the rope (130 feet) centered at the corner of the barn where the cow is tethered. The grazing area is the portion of the circle that lies outside the barn.
Since the barn is 8 feet by 8 feet, it covers a square area of 64 square feet. The radius of the circle is 130 feet, so the area of the circle is π(130)^2 square feet.
To find the maximum grazing area, we need to subtract the area of the barn from the area of the circle.
Area of circle = π(130)^2 square feet = 53,407.08 square feet
Area of barn = 64 square feet
Maximum grazing area = Area of circle - Area of barn
= 53,407.08 - 64
= 53,343.08 square feet (rounded to two decimal places)
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If 6^(2x)=4 find 36^(6x-2) could anyone help me please?
Answer:
3.160
Step-by-step explanation:
You can solve for x using logarithm.
Rewrite in logarithm form
\(log_{6}4=2x\\\\x=\frac{log_64}{2}\\x=\frac{\frac{log4}{log6}}{2}\\x=\frac{log4}{log6} * \frac{1}{2}\\x=\frac{log4}{log6 * 2}\\x\approx0.386852807\\36^{6(0.386852807)-2} \approx3.160\)
The midpoint of AB is M(-5, 4). If the coordinates of A are (-4, 2), what are the coordinates of B?
Answer:
(-6, 6)
Step-by-step explanation:
Let the coordinates of point B be (x, y)
Since, M is the midpoint of AB.
Therefore, by mid-point formula:
\( - 5 = \frac{ - 4 + x}{2} \\ - 5 \times 2 = - 4 + x \\ - 10 + 4 = x \\ x = - 6 \\ \\ 4 = \frac{2 + y}{2} \\ 4 \times 2 = 2 + y \\ 8 = 2 + y \\ 8 - 2 = y \\ y = 6 \\ \\ (x, \: \: y) = ( - 6, \: \: 6)\)
Thus, the coordinates of point B are (-6, 6).
The coordinate of B is (-6, 6) if the midpoint of AB is M(-5, 4) and the coordinates of A are (-4, 2),
What is an ordered double?It is defined as a representation of coordinates in a two-dimensional coordinate plane. It has a list of two elements in it, such as (x, y).
We have:
The midpoint of AB is M(-5, 4).
The coordinate of A is (-4, 2)
Let the coordinate of B is (x, y)
By using the midpoint property:
(-4+x)/2 = -5
-4 + x = -10
As we know, the relation between two variables, if we plot the graph of the linear equation we will get a straight line.
If in the linear equation, one variable is present, then the equation is known as the linear equation in one variable.
-4 + x = -10
It is a linear equation in one variable:
x = -6
Similarly for y:
(2+y)/2 = 4
2 + y = 8
y = 6
The coordinate of B is (-6, 6)
Thus, the coordinate of B is (-6, 6) if the midpoint of AB is M(-5, 4) and the coordinates of A are (-4, 2),
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A rocket is fired into the air modeling the equation h = -16t2 + 512t + 50, where "t" is the time in seconds and "h" is the
3
height in feet
Q11: Triangle D has been dilated to create triangle D′. Use the image to answer the question.
image of a triangle labeled D with side lengths of 18, 24, and 30 and a second triangle labeled D prime with side lengths of 6, 8, and 10
Determine the scale factor used.
Scale factor of one third
Scale factor of 3
Scale factor of 4
Scale factor of one fourth
the scale factor used in the dilation of triangle D to create triangle D' is one-third. This means that every length in triangle D' is one-third the length of the corresponding length in triangle D.
How to solve the question?
To determine the scale factor used in the dilation of triangle D to create triangle D', we need to compare the corresponding sides of both triangles. The corresponding sides of two similar triangles are proportional, meaning that they have the same ratio.
In this case, we can see that the length of every side of triangle D' is one-third the length of the corresponding side of triangle D. For example, the length of the shortest side of triangle D is 18, while the length of the shortest side of triangle D' is 6. Similarly, the length of the longest side of triangle D is 30, while the length of the longest side of triangle D' is 10.
We can use this information to find the scale factor by dividing the length of any side of triangle D' by the length of the corresponding side of triangle D. Let's choose the shortest side for this calculation:
scale factor = length of corresponding side in D' / length of corresponding side in D
scale factor = 6 / 18
scale factor = 1/3
Therefore, the scale factor used in the dilation of triangle D to create triangle D' is one-third. This means that every length in triangle D' is one-third the length of the corresponding length in triangle D.
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Which expression is NOT equivalent to
(m-5) *3?
a) 3 * m -15
b) 3 * m - 5
c) 3m - 15
d) 3 * m - 3 * 5
Answer:
b) 3 * m - 5
Step-by-step explanation:
i rember a test i took on these