Which expression is equivalent to (3x - 5 y) + (x + 2 y)?

A) 4x - 7y
B) 4x - 3y
C) 4x + 3y
D) 4x + 7y

Can someone answer this question? : )

True or false: the graph of y=f(bx) is a horizontal compression of the graph y=f(x) if b< 1

Aplane intersects a pris paralel to the base of the prism. the cross section is a polygon wth eight sides. how many sides does the base of the prism have? a. 10 b. 8 c. 7 d. 9