First off, nicely done on the exponents. You'd be surprised on how bad some look ,:D
a)

b)
To simplify this expression we need, at first, to find like terms.
<span>-3x+5y-2+7x-8y</span><span>-3x+5 = (</span>-3x+7x)+ (5y-8y) -2+5 = 4x + 3y +3
4x + 3y +3 is the answer.
Answer:
2.08333333333
Step-by-step explanation:
fromm google
can I have brainliest
Bad question. Volume is cubic units, not square units.