F(x)=-x^2+8x-20 find the max/min value

My favorite songstress gives away 25% of this side of her signature fragrance collection to her charity last month her sales were 1200 how much of her sales did she donate

Use the inverse of the function y=x^2-18x to find the unknown value [tex]y = \sqrt{bx + c \: + d} [/tex]

Find and simplify an expression for the area of five rows of x squares with side lengths of x centimeters.