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3 years ago

5

I need help 8th grade math

2 answers:

snow_lady [41]3 years ago

7 0

The answer is c i believe

kodGreya [7K]3 years ago

6 0

I believe the answer is C

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Which product is greater 9×10 or 9×17 how can you tell without finding the products?

nirvana33 [79]

Answer:

9×17

Step-by-step explanation:

because 17 is greater than 10.

3 0

3 years ago

Read 2 more answers

Statistics professors believe the average number of headaches per semester for all students is more than 18. From a random sampl

kompoz [17]

Complete Question

Statistics professors believe the average number of headaches per semester for all students is more than 18. From a random sample of 15 students, the professors find the mean number of headaches is 19 and the standard deviation is 1.7. Assume the population distribution of number of headaches is normal.the correct conclusion at $\alpha =0.001$ is?

Answer:

There is no sufficient evidence to support the professor believe

Step-by-step explanation:

From the question we are told that

The population mean is $\mu = 18$

The sample size is $n = 15$

The sample mean is $\= x = 19$

The standard deviation is $\sigma = 1.7$

The level of significance is $\alpha = 0.001$

The null hypothesis is $H_o: \mu = 18$

The alternative hypothesis is $H_a : \mu > 18$

The critical value of the level of significance from the normal distribution table is

$Z_{\alpha } = 3.290527$

The test hypothesis is mathematically represented as

$t = \frac{\= x - \mu }{ \frac{\sigma}{ \sqrt{n} } }$

substituting values

$t = \frac{ 19 - 18}{ \frac{1.7}{ \sqrt{15} } }$

$t = 2.28$

Looking at the value of t and $Z_{\alpha }$ we can see that $t < Z_{\alpha }$ so we fail to reject the null hypothesis.

This mean that there is no sufficient evidence to support the professor believe

3 0

3 years ago

4(x + 10) < 20 What is the answer

lukranit [14]

Answer:

x < -5

Step-by-step explanation:

Distribute 4 to x and 10: 4x + 40 < 20

Subtract 40 from both sides: 4x < -20

Divide by 4: x < -5

6 0

2 years ago

Which is one purpose of cell division?

Lady_Fox [76]

B, because when the organism divides the cells become specialized and continue to divide.

7 0

3 years ago

(y= –2x – 5<br> Ty= 2x – 2

Elden [556K]

Answer:

t=2x-2/-2x-5

Step-by-step explanation:

y=-2x-5

ty= 2x-2

add the y value in

t-2x-5=2x-2

combine like terms

t=4x+3

hope this helps :)

4 0

3 years ago