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Jet001 [13]
3 years ago
10

Simplify the expression 8h +(-7.7d) - 13+5d - 3.1h.

Mathematics
1 answer:
Anna007 [38]3 years ago
8 0

Answer:

4.9h−2.7d−13

Step-by-step explanation:

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6x + ____ = 10 Please find the blank.
andre [41]

Answer:

6x +4=10

I think this is answer

7 0
2 years ago
A bookstore had 80 copies of a magazine. Yesterday, it sold 2/5 of them. Today, it sold 1/4 of what remained. How many copies do
lorasvet [3.4K]
 (80 x 3/5) x 3/4
= 48 x 3/4 
= 36 copies will be left
 
5 0
3 years ago
Read 2 more answers
An engineer has designed a valve that will regulate water pressure on an automobile engine. The valve was tested on 270 engines
marin [14]

Answer:

The null hypothesis failed to be rejected.

There is not enough evidence to support the claim that the valve pressure is significantly different from 5.5 psi.

P-value = 0.04

Test statistic z=2.05

Step-by-step explanation:

This is a hypothesis test for the population mean.

The claim is that the valve pressure is significantly different from 5.5 psi.

Then, the null and alternative hypothesis are:

H_0: \mu=5.5\\\\H_a:\mu\neq 5.5

The significance level is 0.02.

The sample has a size n=270.

The sample mean is M=5.6.

The standard deviation of the population is known and has a value of σ=0.8.

We can calculate the standard error as:

\sigma_M=\dfrac{\sigma}{\sqrt{n}}=\dfrac{0.8}{\sqrt{270}}=0.049

Then, we can calculate the z-statistic as:

z=\dfrac{M-\mu}{\sigma_M}=\dfrac{5.6-5.5}{0.049}=\dfrac{0.1}{0.049}=2.054

This test is a two-tailed test, so the P-value for this test is calculated as:

\text{P-value}=2\cdot P(z>2.054)=0.04

As the P-value (0.04) is bigger than the significance level (0.02), the effect is not significant.

The null hypothesis failed to be rejected.

There is not enough evidence to support the claim that the valve pressure is significantly different from 5.5 psi.

7 0
3 years ago
Askldfjlaksndv; ioweh;arkbg u;arighuvaerg
Papessa [141]
I certainly agree...
7 0
3 years ago
Change 28%to a fraction or mix number
Otrada [13]
28/100 or 7/25
You can just add 100 as the denominator. <span />
6 0
3 years ago
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