How do i solve
-4(2x+5)+8x+20

Given f(x)= 9x+1 and g(x)=x^3, choose the expression (f*g)(x)

You and a friend went to the movies.you spent half your money on tickets. then you spent 1/4 of the money on popcorn, $2 on candy, and $3 on a soda. if you have $1 left, hiw much money did u take to the movies?

Whats are the trickiest steps to do when adding or subtracting rational expressions? how does knowledge of rational numbers u in adding and subtracting rational expressions?