Out of the 3 choices, I’d say it’s C.
180 degrees because 180 degrees means a straight line and it’s not close to 90, a right angle. It seems like a closer angle to a straight line.
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We are asked to simplify the expression
.

That's exactly what we need to do - combine like terms.
So, we subtract:

Which gives us:

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Answer:
Step-by-step explanation:
The answer is c. 1/9.
If x = -2, y = -1, z = 3
then, (-2(-1) -(-1)^2) / 3(3)
(2 - 1)/3(3)
1/9
SA=6A2 so 6 times 49 squared is 294mmsquared