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3 years ago

5

mustafa is putting a sidewalk using two diffrent style bricks, one style brick is 8 inches long, and the other style brick is 6

inches long ,and he intends to use y of these. his sidewalk is to be 288 inches long write down an equation to represent the situation

1 answer:

Svetlanka [38]3 years ago

3 0

Answer:

8y+6y=288

Step-by-step explanation:

8y+6y= 12y

12y=288

12y divide by 12 = 288 divided by 12 =

y=24

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15

Step-by-step explanation:

Because x=y÷7

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3 years ago

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2 years ago

42.5% of what is 20.57

aliina [53]

In math,
"of" is the same as "×" and "is" means "="

42.5% of x = 20.57
42.5% × x = 20.57
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4 years ago

What is 5 + 2x = 2x+6?What does the value of x equal

blondinia [14]

Answer:

No solution

Step-by-step explanation:

5+2x=2x+6

1st- Subtract 5 from each side

2x=2x+6-5

2nd- Subtract 2x from each side

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Simplify

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Since the x terms had to be eradicated, there is no solution.

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3 years ago

A random sample of 16 men have a mean height of 67.5 inches and a standard deviation of 2.22.2 inches. Construct a 99% confiden

saw5 [17]

Answer: $\approx1.49$

Step-by-step explanation:

We know that the confidence interval for population standard deviation is given by :-

$\sqrt{\dfrac{(n-1)s^2}{\chi^2_{\alpha/2}}}$

, where n= sample size

s = sample standard deviation.

$\chi^2_{\alpha/2}$ and $\chi^2_{1-\alpha/2}$ = Chi-square critical value for degree of freedom (n-1) and significance level ( $\alpha$ ).

Given : $\alpha=1-0.99=0.01$

n= 16

Critical ch-square values for degree of freedom 15 and $\alpha=0.01$ will be :

$\chi_{\alpha/2}=\chi_{0.005}=32.80132$

$\chi_{1-\alpha/2}=\chi_{0.995}=4.6009$

Then , the required 99% confidence interval for the population standard deviation will be :

$\sqrt{\dfrac{(15)(2.2)^2}{32.80132}}$

$\sqrt{2.21332556129}$

$1.48772496157$

$\approx1.49$

Hence, the a 99% confidence interval for the population standard deviation :

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3 years ago