3 years ago

3×-7 equivalent expressions A. -21 B. 4 C. -4 D. 21

Mathematics

1 answer:

USPshnik [31]3 years ago

6 0

Answer:

-21

Step-by-step explanation:

3x7=21 and a negative x a positive is always negative

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Please please please please please help me!!!!!

Bond [772]

Answer:

Step-by-step explanation: just trust me.

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3 years ago

Which expression is NOT equivalent to 6x + (5x + 10)?

kondor19780726 [428]

To find the answer test all the possible solutions
6x+(5x+10)
= 6x+5x+10
=11x+10

A) 11x+10

B) (6x+10)+5x
= 6x+10+5x
=11x+10

C) 5(x+10)+5x
= 5x+50+5x
= 10x+50, this is not equivalent.

D) 6x+5(x+10)
= 6x+5x+50
= 11x+50, this is not equivalent either

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4 years ago

Find the distance between points (0,-8) and (3,-2)

kompoz [17]

$\bf~~~~~~~~~~~~\textit{distance between 2 points} \\\\ (\stackrel{x_1}{0}~,~\stackrel{y_1}{-8})\qquad (\stackrel{x_2}{3}~,~\stackrel{y_2}{-2})\qquad \qquad d = \sqrt{( x_2- x_1)^2 + ( y_2- y_1)^2} \\\\\\ d=\sqrt{[3-0]^2+[-2-(-8)]^2}\implies d=\sqrt{(3-0)^2+(-2+8)^2} \\\\\\ d=\sqrt{3^2+6^2}\implies d = \sqrt{9+36}\implies d=\sqrt{45}\implies d\approx 6.71$