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MA_775_DIABLO [31]
3 years ago
12

Use the linear combination method to solve the system of equations PLZ HELP I WILL GIVE BRAINLIEST AND ITS WORTH A LOT OF POINTS

, PLZZZZZZZZZZZZZZZZ
2x-3y=13
2x+4y=-8
Mathematics
1 answer:
jasenka [17]3 years ago
7 0
2x-3y=13...(1)
2x+4y=-8...(2)

Multiply equation 2 by -1 to eliminate x

2x-3y=13
+ -2x-4y=8
—————
-7y=21
y=-3
Substitute y=-3 into equation 2
2x+4(-3)=-8
x=2

Therefore, the solution to the system is (2, -3)
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RoseWind [281]

Answer:

angle 6 is 135 degrees

Step-by-step explanation:

6 and 7 are supplementary angles meaning that together they equal 180.

180-65=135

5 0
3 years ago
A psychologist wants to estimate the proportion of people in a population with IQ scores between 80 and 140. The IQ scores of th
ryzh [129]

Using the Empirical Rule, it is found that the proportion of people in a population with IQ scores between 80 and 140 is of 0.95 = 95%.

<h3>What does the Empirical Rule state?</h3>

It states that, for a normally distributed random variable:

  • Approximately 68% of the measures are within 1 standard deviation of the mean.
  • Approximately 95% of the measures are within 2 standard deviations of  the mean.
  • Approximately 99.7% of the measures are within 3 standard deviations of the mean.

Considering the mean of 110 and the standard deviation of 15, we have that:

  • 80 = 110 - 2 x 15.
  • 140 = 110 + 2 x 15.

These values are both the most extreme within 2 standard deviations of the mean, hence the proportion of people in a population with IQ scores between 80 and 140 is of 0.95 = 95%.

More can be learned about the Empirical Rule at brainly.com/question/24537145

#SPJ1

7 0
2 years ago
HELP ME PLEASE I NEED HELP ON THIS PLEASE ANSWER ILL MARK U BRAINLIEST IF YOU HAVE KIK OR SOMETHING PLEASE GIVE IT TO ME I NEED
nikklg [1K]

here's the answers

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5 0
3 years ago
Jonathan's class has 30 boys. Of the students in his class, 60% are girls. How many girls are in Jonathan's class?
miv72 [106K]

Answer:

18

Step-by-step explanation:

10% of 30 = 3

50% of 30 = 15

10%+50%=60%

3+15=18

5 0
3 years ago
There are 28.35 grams in an ounce and 2.21 pounds in a kilogram. Miriam converted 7 kilograms to ounces, but her answer is not c
Serggg [28]

Answer: C

: Miriam multiplied correctly, but her third fraction should be .S

Step-by-step explanation: Miriam used the unit conversation upside down. The 7000 g should have been multiplied by 1oz/28.35g

The grams cancel and the division of 7000 be 28.35 results in 246.91 oz Round to 252oz.

Alternative: 7kg (2.21 lb/kg)(16oz/lb)=252.5oz

The kg and lbs cancel and the amount of ounces remains.

3 0
3 years ago
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