Ralph drove 272 miles in 4 hours. What was his average
speed? (per single hour – unit rate)PLEASE HELP MEE

The group of participants who are not exposed to the independent variables are the known as the control group.

Good luck! :)

The simplified form of the expression -6w + (–8.3) + 1.5+ (–7w) is -13w - 6.8.

Given the expression in the question;

-6w + (–8.3) + 1.5+ (–7w)

To simplify, first remove the parenthesis

Note that;

-6w + × - 8.3 + 1.5 + × - 7w

-6w - 8.3 + 1.5 - 7w

Next collect and add like terms

-6w - 7w - 8.3 + 1.5

Add -6w and -7w

-13w - 8.3 + 1.5

Add -8.3 and 1.5

-13w - 6.8

Therefore, -13w - 6.8 is the simplified form.

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Using the formula of combination and probability theorem , The answer is b) 75.

Combinations are mathematical operations that count the number of potential configurations for a set of elements when the order of the selection is irrelevant.

The formula for combination is:

\(C(n,r) = \frac {n!}{r!(n-r)!}\)

selecting 1 blue ball from 5 blue balls = C(5,1)

=5

selecting 2 orange balls from 6 balls = C(6,2)

=15

Total ways of selection = 5*15=75

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The given statement "As the level of confidence increases the number of item to be included in a sample will decrease when the error and the standard deviation are held constant." is False because error increases.

As the level of confidence increases, the required sample size will increase when the error and standard deviation are held constant.

This is because as the level of confidence increases, the range of the confidence interval also increases, which requires a larger sample size to ensure that the estimate is precise enough to capture the true population parameter with the desired level of confidence.

For example, if we want to estimate the mean height of a population with a 95% confidence interval and a margin of error of 1 inch, we would need a larger sample size than if we were estimating the same mean height with a 90% confidence interval and the same margin of error.

The larger sample size ensures that the estimate is more precise and that we have a higher level of confidence that it captures the true population parameter.

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The value of T'(7) obtained after taking the first differential of the function is 36.

Given the T(p) = 36(p + 1) - 1/3

Diffentiate with respect to p

T'(p) = d/dp [36(p + 1) - 1/3]

= 36 × d/dp (p + 1) - d/dp (1/3)

= 36 × 1 - 0

= 36

This means that after 7 practice sessions, the rate of change of the time it takes to perform the task with respect to the number of practice sessions is 36 minutes per practice session.

Therefore, T'(p) = 36.

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Answer:

1. f = 16 degrees

2. h = 10 degrees

Step-by-step explanation:

1. f = (180 - 67+46 - 4) / 4

2. h = (180 - 60 + 90) / 3

Answer:

f=16

h=10

Step-by-step explanation:

4f+3+46+67=180

180-(3+67+46)=64

64/4=16

f=16

h=10

60+90+3h=180

h= 10

A line, in core the x-axis really, that goes to infinity, so we can draw an infinite number of perpendicular lines on it all the way.

The given equation is y=0.

In mathematics, an equation is a formula that expresses the equality of two expressions, by connecting them with the equals sign =.

Since y=0, the line will pass through x-axis.

Now, y = 0 is a line, in essence the x-axis really, that goes to infinity, so we can draw an infinite amount of perpendicular lines on it all the way.

Example, the lines passing through (1, 0), (2, 0), (3, 0), (4, 0) are perpendicular to the line y=0.

Therefore, a line, in core the x-axis really, that goes to infinity, so we can draw an infinite number of perpendicular lines on it all the way.

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The region is made up of

• a right triangle with short leg 10 m and hypotenuse 26 m

• a parallelogram with sides 40 m and 26 m (the 26-m side corresponds to the aforementioned hypotenuse)

• another triangle with two known legs of length 20 m and 26 m

Find the height of the right triangle using the Pythagorean theorem. If the height is h, then

(10 m)² + h² = (26 m)²   ⇒   h² = 576 m²   ⇒   h = 24 m

This height is common to all three shapes.

Now find the area of each shape.

• right triangle:

1/2 × (10 m) × (24 m) = 120 m²

• parallelogram:

(40 m) × (24 m) = 960 m²

• other triangle:

• 1/2 × (20 m) × (24 m) = 240 m²

Then the total area of the shaded region is 1320 m².

Answer:

No.

Step-by-step explanation:

If I multiplied 2 by 9 to get 18, I would have to do the same to the 1. This would make the ratio 9:18, not 13:18.

Therefore, these two ratios are not equivalent.

Answer:

123456789101112131415161718192021222324252627282930

The correct inequality to represent the situation where everyone has to spend at least 10 dollars but less than 20 dollars in a gift exchange is 10 ≤ x < 20. (option b).

The correct inequality to represent the situation is B. 10 ≤ x < 20. This inequality reads "x is greater than or equal to 10, but less than 20". In other words, the amount of money each person spends (represented by x) must be at least 10 dollars, but cannot exceed 20 dollars.

To understand why this is the correct inequality, let's break it down. The symbol ≤ means "less than or equal to", and the symbol < means "less than". So, 10 ≤ x means "x is greater than or equal to 10", and x < 20 means "x is less than 20". Combining these two expressions gives us the inequality 10 ≤ x < 20, which represents the range of values that x can take on in this gift exchange.

Hence the correct option is (b).

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The equation of the proportional relationship for the total cost of purchasing x footballs is given as follows:

y = 9x.

A proportional relationship is a type of relationship between two quantities in which they maintain a constant ratio to each other. This means that if one quantity is multiplied by a certain factor, the other quantity will also be multiplied by the same factor.

The equation that defines the proportional relationship is given as follows:

y = kx.

In which k is the constant of proportionality, representing the increase in the output variable y when the constant variable x is increased by one.

From the table, when x increases by 1, y increases by 9, hence the constant is given as follows:

k = 9.

Then the equation that models the proportional relationship is given as follows:

y = 9x.

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Answer:

T²⁵⁴÷T²⁴³=

T²⁵⁴-²⁴³=

=T¹¹

done and thank you

Answer:

x=48 because 180-156=24. 108+24=132 180-132=48

Answer:

Step-by-step explanation:

1/2 x 2 = 1    1+ 1/4 = 1 1/4 cup of cheese

2/3 x 2 = 4/3 = 1 1/3 + 0.5/3 = 1 1.5/3 cup of milk

4 divide 2 = 2 2 x 5 = 10 potatoes

Answer:

Yes they are same shape but different size

Step-by-step explanation:

Answer:

answer is -1/2

have a nice day

(a)   3/4

(b)   F(x) = ∫f(x)dx = ∫0^x f(t)dt, where x ≥ 0

(c)   1

(a) Using the definition, we can calculate P r(1 < x < 3) as follows:
P r(1 < x < 3) = ∫1^3f(x)dx = ∫1^2 (x/4)dx + ∫2^3 (4-x)/4dx
= [x^2/8]1^2 + [(4x - x^2/2]2^3
= 1/4 + 5/4 = 3/4

(b) The distribution function of X is F(x) = ∫f(x)dx = ∫0^x f(t)dt, where x ≥ 0.

(c) To find µ = E(X), σ2 , σ for X, we need to use the definition of expected value and variance, respectively:
µ = E(X) = ∫-∞^∞xf(x)dx = ∫0^2 x^2/8 dx + ∫2^4 (4x - x^2/2)dx
= [x^3/24]0^2 + [(4x^2 - x^3/3]2^4
= 0 + 7 = 7

σ2 = Var(X) = ∫-∞^∞(x - µ)^2f(x)dx
= ∫0^2(x - 7)^2(x/4)dx + ∫2^4 (x - 7)^2(4-x)/4dx
= [x^3/24 -14x^2/3 +98x/3]0^2 + [(4x^3 -14x^2 +98x]2^4
= 7 + 36 = 43

σ = √σ2 = √43 ≈ 6.55
a) We have to calculate P r(1 < x < 3) using the definition of the probability density function. f(x) = ( x/4 for 0 < x ≤ 2 (4−x)/4 for 2 < x < 4) ∫f(x)dx = ∫(x/4)dx for 0 < x ≤ 2 ∫f(x)dx = ∫((4−x)/4)dx for 2 < x < 4 = ∫(x/4)dx | from 1 to 2 + ∫((4−x)/4)dx | from 2 to 3= (x^2/8) | from 1 to 2 + [(4x-x^2)/8] | from 2 to 3 = (2-1)/8 + (12-8-2+4)/8= 1/8= 0.125 The probability of 1 < x < 3 is 0.125. b) The distribution function for X is: F(x)=0 for x ≤ 0∫f(x)dx for 0 < x ≤ 2= (x^2/8) + C1 for 0 < x ≤ 2∫f(x)dx for 2 < x < 4= (x/4-2) + C2 for 2 < x < 4= 1 for x ≥ 4c) We have to find µ = E(X), σ2, and σ for X using the definition of the probability density function. µ = E(X) = ∫xf(x)dx from 0 to 4 ∫f(x)dx for 0 < x ≤ 2= ∫((x^2)/16)dx for 0 < x ≤ 2 = (x^3/48) | from 0 to 2= 2/3 ∫f(x)dx for 2 < x < 4= ∫((4x−x^2)/16)dx for 2 < x < 4 = [(2x^2−(x^3)/12)/16] | from 2 to 4= (16−16−(16−8))/48= 1/3 ∴µ= (2/3) + (1/3)= 1 E(X) = 1 σ^2 = V(X) = E(X^2)- (E(X))^2=E(X^2)- µ^2 ∫x^2f(x)dx from 0 to 4 ∫f(x)dx for 0 < x ≤ 2= ∫((x^3)/16)dx for 0 < x ≤ 2 = (x^4/64) | from 0 to 2= 2 ∫x^2f(x)dx from 0 to 4 ∫f(x)dx for 2 < x < 4= ∫((4x^2-2x^3+x^4)/16)dx for 2 < x < 4 = [(2x^3-3x^4+(x^5)/5)/80] | from 2 to 4= (128−240+32−8−64/5+24/5)/80= 8/15 σ^2 = E(X^2)- (E(X))^2=2−1=1 σ = sqrt(σ^2)= 1

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According to a recent survey of 1,001 adult Canadians, 27 percent of respondents indicated that they do not want to be unionized.

The survey of 1,001 adult Canadians asked respondents about their preference regarding unionization. Out of the total respondents, 27 percent expressed that they do not want to be unionized. This percentage represents the proportion of individuals who indicated a lack of interest or desire to be part of a labor union.

It is important to note that without additional information about the survey methodology, sample representation, and any potential biases, the result should be interpreted within the context of the survey's limitations. The percentage obtained from the survey reflects the preferences of the respondents in the sample but may not necessarily represent the opinions of the entire population of adult Canadians.

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Answer:

BC = 20

Step-by-step explanation:

Since B is the midpoint of AC , then

AB = BC = \(\frac{1}{2}\) AC = \(\frac{1}{2}\) × 40 = 20

Answer:

pppp

Step-by-step explanation:

ppppp

The area enclosed by the curve x = t^2 − 3t, y = √t and the y-axis is 2.08 square units.

We have been given parametric equations x = t^2 − 3t, y = √t

We need to find the area enclosed by the curve x = t^2 − 3t, y = √t and the y-axis.

Consider x = 0

So, t^2 − 3t =  0

t(t - 3) = 0

t = 0   or  t = 3

Let f(t) =  t^2 − 3t and g(t) = t

Differentiate the curve f(t) with respect to t.

f'(t) = 2t - 3

NWe know that the formula to find the area under the curve.

A = ∫[a to b] g(t)f'(t) dt

here, a = 0 and b = 3

so, A = ∫[0 to 3] √t (2t - 3) dt

A = ∫[0 to 3] (2t√t - 3√t) dt

A = ∫[0 to 3] (2t^(3/2) - 3t^(1/2)) dt

A = [4/5 t^(5/2) - 2 t^(3/2)]_[t = 0, t = 3]

A = 4/5 3^(5/2) - 2 3^(3/2) - 0 + 0

A = 4/5 3^(5/2) - 2 3^(3/2)

A = 6√3 /5

A = 2.08

Therefore,  the area of the curve is 2.08 square units.

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Answer:

The awnser to this equation is 120 cents

The cost of using a 200-watt television for 30 days, turned on for 2 hours per day, would be $1.20.  

To calculate the cost of using a 200-watt television for 30 days with 2 hours of daily usage at 10 cents per kilowatt-hour, we need to find the total energy consumption and then multiply it by the cost per kilowatt-hour.

First, let's find the total energy consumption:

1. Daily energy usage: 200 watts * 2 hours = 400 watt-hours
2. Monthly energy usage: 400 watt-hours * 30 days = 12,000 watt-hours

Now, we need to convert watt-hours to kilowatt-hours:
3. Monthly energy usage in kilowatt-hours: 12,000 watt-hours / 1,000 = 12 kWh

Finally, let's calculate the cost:
4. Cost of using the television for 30 days: 12 kWh * 10 cents per kWh = 120 cents

So, the cost of using a 200-watt television for 30 days with 2 hours of daily usage at 10 cents per kilowatt-hour is 120 cents.

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Answer:

12,14,13,15,17,16,19,18

Step-by-step explanation:

The effective interest on £2000 at a 3% interest rate compounded quarterly over a period of 4 years is approximately £245.15.

To calculate the effective interest, we need to use the formula for compound interest:

A = P(1 + r/n)^(nt)

Where:

A = the future value of the investment (including interest)

P = the principal amount (initial investment)

r = the annual interest rate (as a decimal)

n = the number of compounding periods per year

t = the number of years

In this case, the principal amount (P) is £2000, the annual interest rate (r) is 3% (or 0.03 as a decimal), the compounding is done quarterly (n = 4), and the investment period (t) is 4 years.

Plugging the values into the formula:

A = £2000(1 + 0.03/4)^(4*4)

= £2000(1 + 0.0075)^16

= £2000(1.0075)^16

≈ £2000(1.126825)

Calculating the future value:

A ≈ £2253.65

To find the effective interest, we subtract the principal amount from the future value:

Effective Interest = £2253.65 - £2000

≈ £253.65

Therefore, the effective interest on £2000 at a 3% interest rate compounded quarterly after 4 years is approximately £253.65.

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The ratio of the time Thabo spent doing homework to the time he spent at school is 2:7.

Ratio refers to the relative size of a quantity compared to another.

Ratios are expressed as percentages, from 0% to 100%, as fractions, as proportions or decimals, from zero to one, and in ratio forms (:).

To compute the ratio as a decimal, it is the quotient of one quantity and another comparative quantity.

Activity                      Time

Sleeping                   8 hours

At school                  7 hours

Doing homework    2 hours

Playing sport            4 hours

Watching TV            2 hours

Eating                       1 hour

Total hours =        24 hours

Ratio of time doing homework to the time spent at school = 2:7

The sum of ratios = 9 (2 + 7)

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Answer:

  the correct choice is marked

Step-by-step explanation:

Let x represent the smaller number. Then the larger number is 8x, and the difference is ...

  8x -x = 280

  7x = 280 . . . . . simplify

  x = 40 . . . . . . divide by 7

The larger number is 8x = 8(40) = 320.

_____

Additional comment

Effectively, we have solved for the multiplier (40) that gives the ratio with 320 on top and a difference between top and bottom of 280:

  \(\dfrac{8}{1}=\dfrac{8\cdot40}{1\cdot40}=\dfrac{320}{40}\)

Answer:

The volume is 960 π in³.

Step-by-step explanation:

Formula: V = πr²h

Given:

r = 8 in

h = 15 in

Solve for the volume in terms of π in³

V = π (8in)²(15in)

V = π (64in²)(15in)

V = 960 π in³

the volume of the right circular cylinder is approximately 30159.2 cubic inches.

To calculate the volume of a right circular cylinder, you can use the formula:

\(V = \pi * r^2 * h\)

Where:

V represents the volume

π is a mathematical constant approximately equal to 3.14159

r is the radius of the cylinder

h is the height of the cylinder

Given:

Radius (r) = 8 in

Height (h) = 15 in

Substituting these values into the formula, we can calculate the volume:

\(V = \pi * (8 in)^2 * 15\) in

\(V = 3.14159 * 64 in^2 * 15\) in

\(V = 30159.2 in^3\)

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