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Bezzdna [24]
3 years ago
11

Question 8 of 49

Mathematics
1 answer:
klio [65]3 years ago
7 0
Ddddddddddddddddddddddddddddddddddddd
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2x-8=x+4. What would x be
CaHeK987 [17]

2x - 8 = x + 4

Collecting like terms,

2x - x = 4 + 8

Since the signs change when its position changes.

x = 8 + 4 \\ x = 12

6 0
3 years ago
Read 2 more answers
The time that it takes a randomly selected job applicant to perform a certain task has a distribution that can be approximated b
storchak [24]

Answer:

A task time of 177.125s qualify individuals for such training.

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}

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. Subtracting 1 by the pvalue, we This p-value is the probability that the value of the measure is greater than X.

In this problem, we have that:

A distribution that can be approximated by a normal distribution with a mean value of 145 sec and a standard deviation of 25 sec, so \mu = 145, \sigma = 25.

The fastest 10% are to be given advanced training. What task times qualify individuals for such training?

This is the value of X when Z has a pvalue of 0.90.

Z has a pvalue of 0.90 when it is between 1.28 and 1.29. So we want to find X when Z = 1.285.

So

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

1.285 = \frac{X - 145}{25}

X - 145 = 32.125

X = 177.125

A task time of 177.125s qualify individuals for such training.

7 0
3 years ago
Liang enlarged a photograph to 1 3/4 times it original size. The original photograph was 5 inches wide. What was the width of th
Alja [10]
8.75 inches
5 divided by 4 is 1.25
1.25 x 3 = 3.75
3.75 + 5 = 8.75
7 0
3 years ago
A scale drawing of a kitchen is shown below. (4in by 5in) The scale is 1:20. Show your work to determine the area of the room in
valkas [14]
The answer is 800 square feet. Hope this was helpful! 
5 0
3 years ago
A recipe requires 2.5 teaspoons of sugar to make a candy bar. Which equation shows the number of teaspoons of sugar, y, needed t
Veseljchak [2.6K]

Answer:

your answer would be D. x = 2.5 + y

Step-by-step explanation:

5 0
3 years ago
Read 2 more answers
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