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3 years ago

WILL GIVE BRAINLIEST PLEASE I NEED HELP

Mathematics

1 answer:

densk [106]3 years ago

6 0

The numbers on the left are the x values because the arrows are pointing away from them. The numbers in the right are the y values. Match the y value with the x value that the arrows are pointing from.

-2,-5 , -2,7 , 1,0 , 5,4 , 7, 0

The answer is C.

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a pizza shop offers 30% off the price of a large pizza every Tuesday night. If the regular price is $25, what is the discounted

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You need do like 25$--------100% of real price
x$---------70%

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3 years ago

Read 2 more answers

An aptitude test has a mean score of 80 and a standard deviation of 5. The population of scores is normally distributed. What pr

konstantin123 [22]

Answer:

2.28% of tests has scores over 90.

Step-by-step explanation:

Problems of normally distributed samples are 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:

$\mu = 80, \sigma = 5$

What proportion of tests has scores over 90?

This proportion is 1 subtracted by the pvalue of Z when X = 90. So

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

$Z = \frac{90 - 80}{5}$

$Z = 2$

$Z = 2$ has a pvalue of 0.9772.

So 1-0.9772 = 0.0228 = 2.28% of tests has scores over 90.

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3 years ago

Adam is subtracting 708 – 10 mentally. He thinks

solong [7]

Adam is correct because when the hundreds and tens digit changes in 708, that means that the 7 and 0 will change into 6 and 9

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3 years ago

Jessica's annual salary decreased by 3800, which was a 9% decrease. what was Jessica's original salary?

Andrei [34K]

Answer:

Step-by-step explanation:

x = original salary

$3800 = (1-9%)x = (1-0.09)x = 0.91x

x = $3800/0.91 = $4175.82

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