Find m Given <br> The problem

3x-y=-7 2x + 3y<br><img src="https://tex.z-dn.net/?f=3x%20-%20y%20%3D%20%20-%207%20%5C%20%5C%5C%202x%20%2B%203y%20%3D%2012" id="

Zolol [24]

X=1 y=2.5 I’m not sure if that’s correct but I hope it is.

6 0

2 years ago

Ann went to the store. She bought a book for $4.00, pencils for $2.00, and a notebook for $3.00. What is her change if she paid

agasfer [191]

Answer:

$11 is her change

Step-by-step explanation:

This is a simple adding and subtracing problem.

What we first do is add up 4+2+3=9 then we subtract 9 from 20 which gives us $11

We can check our answer by add up 11 + 9 to see if it equals to 20

8 0

2 years ago

Read 2 more answers

At the beginning of the month a store had a balance of −$554. During the month the store lost another $600. What is the current

Sauron [17]

$-1,154. All you have to do is subtract 600 from -554.

7 0

2 years ago

Read 2 more answers

a delivery truck is transporting boxes of two sizes: large and small. the combined weight of a large box and a small box is 75 p

guajiro [1.7K]

The weights of small and large boxes are 35 pounds and 40 pounds respectively.

<u>Solution:</u>

Given, A delivery truck is transporting boxes of two sizes: large and small.

The combined weight of a large box and a small box is 75 pounds.

The truck is transporting 50 large boxes and 70 small boxes.

And the truck is carrying a total of 4450 pounds in boxes,

We have to find how much does each type of box weigh?

Now, let the weight of small box be “s” pounds, then weight of large box will be 75 – s pounds.

According to the given information,

50 x (75 – s) + 70 x s = 4450

50 x 75 – 50s + 70s = 4450

70s – 50s = 4450 – 3750

20s = 700

2s = 70

s = 35

So, weight of small box is 35 pounds, then weight of large box is 75 – 35 = 40 pounds.

Hence, the weights of small and large boxes are 35 pounds and 40 pounds respectively.

3 0

2 years ago

Yoonie is a personnel manager in a large corporation. Each month she must review 16 of the employees. From past experience, she

ki77a [65]

Answer:

a) $P(3.5 \leq X \leq 4.25) = 0.7492$

b) The 95th percentile is 4.4935 hours.

Step-by-step explanation:

To solve this question, we need to understand the normal probability distribution and the central limit theorem.

Normal Probability Distribution:

Problems of normal distributions 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.

Central Limit Theorem

The Central Limit Theorem estabilishes that, for a normally distributed random variable X, with mean $\mu$ and standard deviation $\sigma$ , the sampling distribution of the sample means with size n can be approximated to a normal distribution with mean $\mu$ and standard deviation $s = \frac{\sigma}{\sqrt{n}}$ .