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3 years ago

Helppp!!! This has to be done by 8!!! And it’s 7:45!!

Mathematics

1 answer:

san4es73 [151]3 years ago

6 0

Answer:

The constant of porportionality is k = 12.5; the equation that describes the relationship is y = 12.5x.

Step-by-step explanation:

When you divide the miles by the hours, it's always 12.5, meaning that k must be 12.5.

If x is the hours and k is 12.5, the equation that describes the relationship is y = 12.5x.

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If x = 5, find the value of<br> a) x2<br> b) (x + 3)2

PtichkaEL [24]

Answer: a) = 10

b) = 16

Step-by-step explanation:

a) as x = 5 so putting the value of x in given equation

5 multiplied by 2 is equal to 10

b) Putting value of x in given equation

= (5 + 3) 2

According to BODMAS solve the brackets first

= 8 x 2

= 16

3 0

3 years ago

Select the equivalent expression.

ANEK [815]

Answer:

Step-by-step explanation:

$\frac{1}{9^{2} }$ =1/81

$9^{\frac{1}{2} }$ =3

$\frac{1^{2} }{9}$ = $\frac{1}{9}$

$9^{-2}$ =1/81

5 0

3 years ago

What is the inverse operation of addition? How do you "undo" addition?

Allisa [31]

Multiplication because you undo it

8 0

3 years ago

Can you conclude with a high degree of confidence that the population means for Iowa and New Jersey students are different? A.

Katen [24]

Complete Question

The complete question is shown on the first uploaded image

Answer:

Option A is correct

Step-by-step explanation:

From the question we are told that

The 95% confidence interval of the mean score of all New Jersey third graders is (58.957 , 63.043)

The sample size is n = 184

The sample average is $\mu = 65 \ points$

The standard deviation is $\sigma = 13 \ points$

The 90% confidence interval for the difference in mean score between lowa and New Jersey is (-6.33 , -1.67 )

The p-value is $p-value = 0.0048$

Generally given that the p-values is very low compared to the level of significance (100 -90 = 10% = 0.10 ) we can reject the null hypothesis which is usually a claim that the means of the population are the same )

Hence the population means are different .

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3 years ago

In a machine, a large gear completes a revolution every minute while a small gear completes a revolution every 24 seconds. If th

gogolik [260]

To make the second gear aligned with the first it would have to rotate 5 times, a total of 120 seconds and/or 2 minutes will pass

So the answer is I.

6 0

3 years ago

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