Which is not equivalent to -2+9a -4+ -3b -1× -7c 10+ -3d -3- -10

A. is the answer

-2 + 9 is 7, and A. -4 + -3 = -7.

- 2 +9 = 7

a.  -3 + -4  = - 7

b, c and d = 7

So the answer is  a

b is 38 degrees.

a is 52 degrees.

this is because if b is 38 and a is 14 degrees more than b than 38+14=52 and 52+38=90 degrees. hope this .

if x = 1, then the answer is 3.5