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kherson [118]
2 years ago
12

Can you Find the solution of the system of equations?

Mathematics
1 answer:
Lunna [17]2 years ago
5 0

Answer:

x = 3

y = 2

Step-by-step explanation:

multiply by -1 the second equation and add the two equations

7x-7y=7\\4x+7y=26

11x=33

x=33/11

x=3

"y" is calculated:

7(3)-7y=7

21-7y=7

-7y=-14

y=\frac{-14}{-7} =2

Hope this helps

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The head of the Westlane Cultural Center wants to get a sense of how quickly pledges from donors arrive at the center. It takes
Rzqust [24]

Answer:

95.64% probability that pledges are received within 40 days

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 = 28, \sigma = 7

What is the probability that pledges are received within 40 days

This is the pvalue of Z when X = 40. So

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

Z = \frac{40 - 28}{7}

Z = 1.71

Z = 1.71 has a pvalue of 0.9564

95.64% probability that pledges are received within 40 days

7 0
3 years ago
What is the solution to the equation below. Round your answer to two
bearhunter [10]

Answer:

<h2>Hey , I will help you.</h2>

Step-by-step explanation:

Given ,

x= 3.1 ,

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= x = 3.1 { Will be itself}

6 0
2 years ago
Please help me !!!! trigonometric ratios !!!
DaniilM [7]

Answer:

Step-by-step explanation:

If the questions  is    "What's x" then the answers is...

Use SOH CAH TOA to recall how the trig functions fit on a triangle

SOH: Sin(Ф)= Opp / Hyp

CAH: Cos(Ф)= Adj / Hyp

TOA: Tan(Ф) = Opp / Adj

use CAH

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5 0
3 years ago
Aspen bakery sold 40 boxes of rolls in one day. Each box holds 6 rolls. How many rolls did the bakery sell?
Gnom [1K]
40 boxes * 6 rolls = 240 rolls
7 0
3 years ago
Read 2 more answers
I need help with 7-11 if u do help me u get a lot of points !!! Please help now!!
Ludmilka [50]

Answer:

#7 = 430

#9 = 16

#11 = 930

Step-by-step explanation:

7 to the power of 2 is 49 /  49+3 is 52  /  52-9 is 43  / 43x10 is 430

66 divided by 11 is 5 /  5 +3 is 8   /   8 X2 is 16

18 -3 is 15  /  15 + 3 is 18 /  18 to the power of 2 is 324  /   324 - 14 is 310

310x3 is 930

3 0
2 years ago
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