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3 years ago

10

Three sixth-grade students competed in the 100-meter dash. The table shows their times.

1 answer:

Sergeeva-Olga [200]3 years ago

5 0

Answer:

It is 12.9, 13.1, 13.2 C.

Step-by-step explanation:

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( 8n - 3n^4 + 10n ^2 ) - ( 3n^2 + 11n ^4 - 7)

DanielleElmas [232]

Answer:

-14n^4 + 7n^2 + 8n + 7

Step-by-step explanation:

( 8n - 3n^4 + 10n^2 ) - ( 3n^2 + 11n^4 - 7)

8n - 3n^4 + 10n^2 - 3n^2 - 11n^4 + 7

- 14n^4 + 7n^2 + 8n + 7

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2 years ago

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Solve the following equation. -8(-x-5)=40+8x

iren [92.7K]

Answer:

all the values

Step-by-step explanation:

$-8(-x-5)=40+8x\\\\-x-5=\frac{40}{-8}+ \frac{8x}{-8} \\\\-x-5=-5-x\\\\-x-5=-x-5\\\\-x=-x-5+5\\\\-x=-x+0\\\\-x=-x\\$

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so all the values for x are solutions

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3 years ago

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The variable Z is directly proportional to X. When X is 3, Z has the value 54. What is the value of Z when X = 12

Ymorist [56]

Given that z is directly proportional to x, then:
zαx
hence;
z=kx
therefore:
k=z/x
when x=3,z=54
thus;
k=54/3
=18
hence;
z=18x
therefore the value of z when x=12 will be:
z=18*12
z=216
The answer is z=216

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3 years ago