|x|=7 what is the answer to this equation

Mathematics

2 answers:

wolverine [178]3 years ago

8 0

Answer:

x=7, or -7

Step-by-step explanation:

brilliants [131]3 years ago

3 0

Answer: -7

Step-by-step explanation: It is saying which numbers absolute value is 7. The absolute value is where the number turns positive, if its positive it stays positive if its negative it turns positive. Absolute value is saying how far is it from 0. -7 is 7 far from 0.

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zepelin [54]

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2 years ago

An engineer has designed a valve that will regulate water pressure on an automobile engine. The valve was tested on 110 engines

slava [35]

Answer:

we will fail to reject the null hypothesis and conclude that the mean pressure is not different from 4.7 psi

Step-by-step explanation:

Let's first define the hypothesis;

Null hypothesis: H0: μ = 4.7

Alternative hypothesis: Ha: μ ≠ 4.7

We have;

Sample size; n = 110

Sample mean; x¯ = 4.6

Variance: σ² = 0.64

Standard deviation; σ = √0.64 = 0.8

Formula for test statistic is;

z = (x¯ - μ)/(σ/√n)

z = (4.6 - 4.7)/(0.8/√110)

z = -0.1/0.0763

z = -1.31

From online p-value from z-score calculator attached, using; z = -1.31, two tailed hypothesis, significance value of 0.1, we have;

P-value = 0.190196

The p-value is greater than the significance value and thus we will fail to reject the null hypothesis and conclude that the mean pressure is not different from 4.7

σ μ