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3 years ago

Use the elimination method to solve the following equations 5x+7y=9 10x+14y=18

Mathematics

1 answer:

kolbaska11 [484]3 years ago

8 0

Answer:

Step-by-step explanation:

10x + 14y = 18.....reduce by dividing everything by 2 and u end up with 5x + 7y = 9

notice how both equations are now the same....means same line.....this means ur solution is : INFINITE SOLUTIONS

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ACT scores have a mean of 20.8 and 9 percent of the scores are above 28. The scores have a distribution that is approximately no

dimaraw [331]

Answer: 5.37

Step-by-step explanation:

Let x = ACT scores.

Given: ACT scores have a mean of 20.8 and 9 percent of the scores are above 28. The scores have a distribution that is approximately normal.

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Now,

$P(X>28)=P(\dfrac{X-\mu}{\sigma}>\dfrac{28-20.8}{\sigma})\\\\= P(z>\dfrac{7.2}{\sigma})\ \ \ \ [z=\dfrac{X-\mu}{\sigma}]$ (ii)

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From (i) and (ii)

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3 years ago

If y varies inversely with the square of x, and y=6 when x=4, find y when x=0.1

sergejj [24]

Answer:

9600

Step-by-step explanation:

y varies inversely with the square of x

y=k/(x^2)

for some non-zero constant k

y=6 when x=4

6=k/(4^2)

k=96

y=96/(x^2)

x=0.1

y=96/(0.1^2)

y=9600

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2 years ago

Find the value of x.

tatiyna

Answer:

x = 19

Step-by-step explanation:

(5x+4)+(x-2)+(3x+7) = 180

5x+4+x-2+3x+7 = 180

9x+9 = 180

9x = 171

x = 171/9

x = 19

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Answer:

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Step-by-step explanation:

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3 years ago

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3 years ago

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