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3 years ago

-4p+9=-5 solve the equation

Mathematics

2 answers:

stiks02 [169]3 years ago

4 0

Answer:

$p = 3.5$

Step-by-step explanation:

Step 1: Subtract 9 from both sides

$-4p + 9 - 9 = -5 - 9$

$-4p = -14$

Step 2: Divide both sides by -4

$-4p / -4 = -14 / -4$

$p = 3.5$

Answer: $p = 3.5$

scoray [572]3 years ago

3 0

Answer:

p = 14/4

Step-by-step explanation:

-4p+9=-5

-4p = -14

p = 14/4

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A manufacturer of tires wants to advertise a mileage interval that ex-cludes no more than 10% of the mileage on tires he sells.

Sergio039 [100]

Answer:

This mileage interval is from 30120 miles and higher.

Step-by-step explanation:

Problems of normally distributed samples can be solved using the z-score formula.

In a set with mean $\mu$ and standard deviation $\sigma$ , the zscore of a measure X is given by:

$Z = \frac{X - \mu}{\sigma}$

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.

In this problem, we have that:

All he knows is that, for a large number of tires tested, the mean mileage was 25,000 miles, and the standard deviation was 4000 miles. This means that $\mu = 25000, \sigma = 4000$ .

A manufacturer of tires wants to advertise a mileage interval that ex-cludes no more than 10% of the mileage on tires he sells. What interval wouldyou suggest?

The lower end of this interval is X when Z has a pvalue of 0.90. That is $Z = 1.28$ .