Can anyone me with these two problems they’re precalculus

The depth of a lake at a certain point, wich is a function of the distance of that point from shore, is 30 feet.

If f(x)=-x^2+6x-1 and g(x)=3x^2-4x-1,find(f+g)(x)

What is the range of the function? f(x)=-2|x+1|? a. all real numbers. b. all real numbers less than or equal to 0. c. all real numbers less than or equal to 1. d. all real numbers greater than or equal to 1