Simplify. 9(y + 7) 63y 7y + 9 9y + 63 16y

Mathematics

1 answer:

Snezhnost [94]3 years ago

5 0

So the right answer is of option C.

Look at the attached picture

Hope it will be helpful to you..

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5. Solve the system of equations. x + y = 6 2x - y = 9

Irina-Kira [14]

First, solve for x
x + y = 6
+
2x - y = 9
——————
3x = 15
x = 5

then just substitute that into one of the equations

(5) + y = 6
y = 1

then make into an ordered pair (x,y)
(5, 1)

3 0

3 years ago

Question 4(Multiple Choice Worth 3 points)

pychu [463]

Side of the square tile = x-3 ⇒ Area = (x-3)² = x² - 6x + 9

6 0

3 years ago

The time for a professor to grade an exam is normally distributed with a mean of 16.3 minutes and a standard deviation of 4.2 mi

dangina [55]

Answer:

A.0.4477

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:

$\mu = 16.3, \sigma = 4.2$