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san4es73 [151]
3 years ago
9

PLZ ANSWER THIS IS FOR AN IMPORTANT TEST

Mathematics
2 answers:
Scrat [10]3 years ago
7 0

Answer:

12

Step-by-step explanation:

Simplify the equation and combine like-terms!

ale4655 [162]3 years ago
7 0

Answer:

x = 12

Step-by-step explanation:

\frac{5}{2} x -7 = \frac{3}{4} x + 14      ............*4\\10x - 28 = 3x + 56\\7x = 84\\x= 12

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What percent of people surveyed from San Francisco wear Adidas shoes? Round to the nearest percent when necessary.
Mama L [17]

Answer:

33

Step-by-step explanation:

Add 165 and 80 to get 245. 80 times 3 = 240.

So 80 is around 1/3 of 240. In other words it is around 33%

6 0
2 years ago
Eight kids got to go to the water park for $60.How many students could go for $195?
Stella [2.4K]
60/8=7.5
So that means one child is $7.50
195/7.5=26
26 students
6 0
3 years ago
suppose X and Y are independent random variables, both with normal distributions. If X has a mean of 45 with a standard deviatio
djyliett [7]

Answer:

0.9772 = 97.72% probability that a randomly generated value of X is greater than a randomly generated value of Y

Step-by-step explanation:

When the distribution is normal, we use 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 question:

\mu_X = 45, \sigma_X = 4, \mu_Y = 35, \sigma_Y = 3

What is the probability that a randomly generated value of X is greater than a randomly generated value of Y

This means that the subtraction of X by Y has to be positive.

When we subtract two normal variables, the mean is the subtraction of their means, and the standard deviation is the square root of the sum of their variances. So

\mu = \mu_X - \mu_Y = 45 - 35 = 0

\sigma = \sqrt{\sigma_X^2+\sigma_Y^2} = \sqrt{25} = 5

We want to find P(X > 0), that is, 1 subtracted by the pvalue of Z when X = 0. So

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

Z = \frac{0 - 10}{5}

Z = -2

Z = -2 has a pvalue of 0.0228

1 - 0.0228 = 0.9772

0.9772 = 97.72% probability that a randomly generated value of X is greater than a randomly generated value of Y

4 0
3 years ago
Add the following rational number7/-27 and 11/18
poizon [28]

Answer:

19/54

Step-by-step explanation:

- 7/27 + 11/18

LCM of the 27, 18 is 54

- 7/27 * (2/2) + 11/18 * (3/3)

- 14/54 + 33/54

33 - 14/54

19/54

please mark me brainlist

3 0
2 years ago
Please help me withthis its realy important that I get it right
Savatey [412]

Answer:

its option C

Step-by-step explanation:

5 0
2 years ago
Read 2 more answers
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