3x-21=57
3x=21+57
3x=78
Divide by 3
X=26
4.6 because -3.2+1.4=4.6 negative +positive = positive
(2x - 2y)(2y + 8)
2x(2y+ 8) - 2y(2y + 8)
2x(2y) + 2x(8) - 2y(2y) - 2y(8)
4xy + 16x - 4y^2 - 16y
The answer is B.
Answer:
x = 9
Step-by-step explanation:
because the angle is the same as 45 degrees