Simplify 5√7+√7−2√7
a.4√7
b.3√21
c.3√7
d.4√21
i really am stuck on this problem.

5√7+√7−2√7

Going from left to right:

5√7+√7 = 6√7

6√7 - 2√7 = 4√7

The answer is A. 4√7

8(-10x+3.5y-7)

8×-10x + 8×3.5y + 8×-7

-80x + 28y - 56

therefore

-80x+28y-56 is the correct answer

6, 10

9, -13

12, -21

18, -23

step-by-step explanation:

you just add 6 to the x-coordinate and subtract 10 from the y-coordinate.