If gravity is 9.81 meters/second at the top of the building what is it in miles per hour

Which values of p and q result in an equation with exactly one solution? px-43=-42x+q choose all answers that apply: a) p=-43 and q=-43 b) p=42 and q=43 c) p=43 and q=−42 d) p=42 and q=42

Combine like terms to make a simpler expression 3z+z

Ijust need these 2 questions answered (the second pic is just confirmation i'm not confident in that answer)