Answer:
-39x^2 + 17x
Step-by-step explanation:
= 5x - 60x^2 + 3 (4x+7x^2)
= 5x - 60x^2 + 12x + 21x^2
= -39x^2 + 17x
-39x^2 + 17x is correct
I checked it
It's true because plane geometry is 2 dimensional and solid geometry is 3 dimensional dont get them confused ok.
2r+(t+r)
2r+t+1r
3r+t
The answer to your question is a^32
so you multiply 12 by 8 =96
