Question 1: Let f(x) = x - 4 and g(x) = x^2 - x

Find and simplify the expression.

(f + g)(- 6) =

(Simplify your answer.)

Question 2:

Let f(x)=2x^2+4 and g(x)= -4x+1.

Find the following.

(f-g)(-2)=

Achemist has 200 ml of a 10% sucrose solution. she adds x ml of a 40% sucrose solution. the percent concentration, y, of the final mixture is given by the rational function: the chemist needs the concentration of the final mixture to be 30%. how many milliliters of the 40% solution should she add to the 10% solution to get this concentration?