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just olya [345]
2 years ago
9

What is 4x • 6y =9c.

Mathematics
1 answer:
LuckyWell [14K]2 years ago
6 0
C=8/3 xy

Downloaded Photomath. That app is the best. Shows you how to get the answer along with the answer so you can learn how to do it for test.

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A Cell Phone company sells cellular phones and airtime in a State. At a recent meeting, the marketing manager states that the av
GarryVolchara [31]

Answer:

The null hypothesis is rejected.

There is enough evidence to support the claim that the average age of the customers differs from 40 years.

The sample does not support the manager claim (the average age seems to differ from 40 years).

Step-by-step explanation:

This is a hypothesis test for the population mean.

The manager claims that the average age of customers is 40 years. As this is an equality, we will test if the average age differs from 40. If the null hypothesis failed to be rejected, the claim of the manager is right.

Then, the claim is that the average age of the customers differs from 40 years.

Then, the null and alternative hypothesis are:

H_0: \mu=40\\\\H_a:\mu\neq 40

The significance level is 0.05.

The sample has a size n=50.

The sample mean is M=38.

As the standard deviation of the population is not known, we estimate it with the sample standard deviation, that has a value of s=7.

The estimated standard error of the mean is computed using the formula:

s_M=\dfrac{s}{\sqrt{n}}=\dfrac{7}{\sqrt{50}}=0.99

Then, we can calculate the t-statistic as:

t=\dfrac{M-\mu}{s/\sqrt{n}}=\dfrac{38-40}{0.99}=\dfrac{-2}{0.99}=-2.02

The degrees of freedom for this sample size are:

df=n-1=50-1=49

This test is a two-tailed test, with 49 degrees of freedom and t=-2.02, so the P-value for this test is calculated as (using a t-table):

P-value=2\cdot P(t

As the P-value (0.049) is smaller than the significance level (0.05), the effect is  significant.

The null hypothesis is rejected.

There is enough evidence to support the claim that the average age of the customers differs from 40 years.

3 0
3 years ago
A survey of teachers in a school found that 7% of Teachers use mobile applications for study activities what decimal number repr
pantera1 [17]

Answer:

.07

Step-by-step explanation:

5 0
3 years ago
Answer and or help would be much appreciated work is due and needs to be submitted
riadik2000 [5.3K]

Answer:

1. D

2. C

3. B

4. A

Step-by-step explanation:

just match up the number y is on the right side and x on the left side like this (x,y)

4 0
2 years ago
3/8 \ 1/4= show your work ASAP
Rashid [163]
12/8=3/2 TIMES THE OPPOSITE <span />
8 0
3 years ago
Read 2 more answers
Jane orders cheese pizza from a pizza restaurant that charges $8 per pizza , Jane cost, in dollars, is a function of the numbers
neonofarm [45]

search des mos on goo gle click graphing calculator type in the equation y =-8x+45 and then copy the graph, I suggest doing one digits and also you didn't send the full question

She can get 5 pizzas using all her money

Finding Maxmium She Can Get

8.00*n ≤ 45.00

n ≤ 45/8 = 5.625

Jane can order at most 5 pizzas.

5 0
2 years ago
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