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3 years ago

Help please! thank u

Mathematics

1 answer:

Alexus [3.1K]3 years ago

5 0

A is NOT a function because for some values of x you get more than one y value. For example if x=2 you get 2 values for y.
b is a function because for each x you get ONLY one y

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Which story problem could be solved using the division problem 30 ÷ 5 = 6?

Lynna [10]

Answer:

"There are 30 chairs in 5 rows. How many chairs are in each row?" Would be the correct story problem.

8 0

3 years ago

Two shooters, Rodney and Philip, practice at a shooting range. They fire rounds each at separate targets. The targets are mark

Sedaia [141]

Complete Question

Answer:

$SE = 0.66}$

$-3.29 < \mu_1 - \mu_2 < -0.70$

Step-by-step explanation:

From the question we are told that

The sample size is n = 60

The first sample mean is $\= x _1 = 8$

The second sample mean is $\= x _2 = 10$

The first variance is $v_1 = 0.25$

The first variance is $v_2 = 0.55$

Given that the confidence level is 95% then the level of significance is 5% = 0.05

Generally from the normal distribution table the critical value of $\frac{\alpha }{2}$ is

$Z_{\frac{\alpha }{2} } = 1.96$

Generally the first standard deviation is

$\sigma_1 = \sqrt{v_1}$

=> $\sigma_1 = \sqrt{0.25}$

=> $\sigma_1 = 0.5$

Generally the second standard deviation is

$\sigma_2 = \sqrt{v_2}$

=> $\sigma_2 = \sqrt{0.55}$

=> $\sigma_2 = 0.742$

Generally the first standard error is

$SE_1 = \frac{\sigma_1}{\sqrt{n} }$

$SE_1 = \frac{0.5}{\sqrt{60} }$

$SE_1 = 0.06$

Generally the second standard error is

$SE_2 = \frac{\sigma_2}{\sqrt{n} }$

$SE_2 = \frac{0.742}{\sqrt{60} }$

$SE_2 = 0.09$

Generally the standard error of the difference between their mean scores is mathematically represented as

$SE = \sqrt{SE_1^2 + SE_2^2 }$

=> $SE = \sqrt{0.06^2 +0.09^2 }$

=> $SE = 0.66}$

Generally 95% confidence interval is mathematically represented as

$(\= x_1 -\= x_2) -(Z_{\frac{\alpha }{2} } * SE) < \mu_1 - \mu_2 < (\= x_1 -\= x_2) +(Z_{\frac{\alpha }{2} } * SE)$

=> $(8 -10) -(1.96 * 0.66) < \mu_1 - \mu_2 < (8-10) +(Z_{\frac{\alpha }{2} } * 0.66)$

=> $-3.29 < \mu_1 - \mu_2 < -0.70$

5 0

3 years ago

V=1/3 Bh, for h<br> A. h= 3V/B<br> B. h=B/3V<br> C. h=V/3B<br> D.h=3B/V

Basile [38]

Answer:

A. h=3v/b

Step-by-step explanation:

v=1/3bh

1) divide by b

v/b=1/3h

2) multiply reciprical

3v/b=h

h=3v/b

3 0

3 years ago

39-12w=7-16 work to plz?

frutty [35]

Answer:

w=4

Step-by-step explanation:

7-16=-9

39-x=-9

39+9=48

39-48=-9

x=48

48/12=4

w=4

7 0

3 years ago

Shirley benson works for levityskool assembling toys. she is paid $2.20 for each item she assembles. how much does she earn for

Natalka [10]

She earns 2.2*278=611.60$

3 0

3 years ago

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