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2 years ago

Stephanie ran four laps around the school track in 7 minutes and 30 seconds. How many seconds per lap is that

Mathematics

2 answers:

madreJ [45]2 years ago

6 0

I got 112 seconds hopefully this helps u but sorry if it doesn't help u

Svetradugi [14.3K]2 years ago

3 0

112.5 seconds per lap. As you need to convert the minutes to seconds, 7 x 60 = 420 + 30 = 450

450/4 = 112.5

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X-18+ (24-3 )=72 just simplify for me to understand it well.

Nataliya [291]

Answer: x = 69

Step-by-step explanation:

X-18+ (24-3 )=72

solve the brackets

x-18 + 21 =72

cllect like terms

x = 72-21+18

x = 69.

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2 years ago

Evaluate 8(7x--3) when x=9

Schach [20]

I will assume that by "Evaluate 8(7x--3) when x=9" you meant:

"Evaluate 8(7x-3) when x=9."

First, substitute 9 for x in 7x-3: 7(9)-3 = 60. Rewrite the problem as:

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2 years ago

Suppose an automotive repair company wants to determine the current percentage of customers who keep up with regular vehicle mai

Nina [5.8K]

Answer: 1692

Step-by-step explanation:

Formula to find the sample size :

$n=p(1-p)(\dfrac{z_{\alpha/2}}{E})^2$

Given : Confidence level : $(1-\alpha)=0.90$

⇒ significance level = $\alpha= 0.10$

z-value for 90% confidence interval (using z-table)= $z_{\alpha/2}=1.645$

Prior estimate of the population proportion (p) of customers who keep up with regular vehicle maintenance is unknown.

Let we take p= 0.5

Margin of error : E= 2%=0.02

Now, the required sample size will be :

$n=0.5(1-0.5)(\dfrac{1.645}{0.02})^2$

Simplify , we get

$n=(0.25)(6765.0625)=1691.265625\approx1692$

Hence, the required sample size = 1692

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3 years ago

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igor_vitrenko [27]

Answer: 1.4

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So, its 2y=2.8

To solve this, you simply divide both sides of the equation by 2.

2 divided by 2 is 0. That leaves you with the y by itself. Then, 2.8 divided by 2 is 1.4

So, y=1.4

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ehidna [41]

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