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4 years ago

8

Ethan goes to a store an buys an item that costs x dollars. He has a coupon for 5% off, and then a 9% tax is added to the discou

nted price. Write an expression in terms of x that represents the total amount that Ethan paid at the register.

1 answer:

choli [55]4 years ago

8 0

Well Ethan’s pretty cool

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Is a rectangle. EA is 12 in. Find the length of the diagonal .

Maurinko [17]

Answer:

hey please saw the figure

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3 years ago

Identify the roots for the equation 5x^{2} − 5x = −5

allochka39001 [22]

Equations : Tiger Algebra gives you not only the answers, but also the complete step by step ... 5 x 2+5 x −5=0 ... 5x^2+5x-5=0 ... Parabola, Finding the Vertex: ... Root 2 at {x,y} = { 0.62, 0.00} ...

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3 years ago

In Pennsylvania the average IQ score is 101.5. The variable is normally distributed, and the population standard deviation is 15

blsea [12.9K]

Answer:

We conclude that the Pennsylvania school district have an IQ higher than the average of 101.5

Step-by-step explanation:

We are given the following in the question:

Population mean, μ = 101.5

Sample mean, $\bar{x}$ = 106.4

Sample size, n = 30

Alpha, α = 0.05

Population standard deviation, σ = 15

First, we design the null and the alternate hypothesis

$H_{0}: \mu = 101.5\\H_A: \mu > 101.5$

We use one-tailed z test to perform this hypothesis.

Formula:

$z_{stat} = \displaystyle\frac{\bar{x} - \mu}{\frac{\sigma}{\sqrt{n}} }$

Putting all the values, we have

$z_{stat} = \displaystyle\frac{106.4 - 101.5}{\frac{15}{\sqrt{30}} } = 1.789$

Now, $z_{critical} \text{ at 0.05 level of significance } = 1.96$

Since,

$z_{stat} > z_{critical}$

We reject the null hypothesis and accept the alternate hypothesis.

Thus, we conclude that the Pennsylvania school district have an IQ higher than the average of 101.5

5 0

3 years ago

After a successful fishing trip, Leo weighed his catch. He determined he caught a total 6.5 kilograms of fish. The recipe Leo wa

seropon [69]

Answer:

6 1/2 Grams

Step-by-step explanation:

Hope this helped!!

4 0

2 years ago

Read 2 more answers

If you add my number to it's self and add 83 you will get the same number as when you add my number 4 times and subtract 25

Deffense [45]

I think you should put in 53 try that

7 0

3 years ago