Translate to an algebraic expression

Question

Twice d
d+2 is the right.

-(y+48)= -y+48 is this right

Answer 1

1. Twice d would be d + d

d + d = 2d

2. -(y+48)= -1(y+48)
= -1(y) + (-1)(48)
= -y + (-48)
= -y -48