The sales tax for an item is $18.80 and it cost $470 before tax. Find the sales tax rate. Write your answer as a percentage. PLS HELP

The function ƒ is defined by ƒ(x) = (x + 3)(x + 1). the graph of ƒ in the xy-plane is a parabola. which interval contains the x-coordinate of the vertex of the graph of ƒ?

Write the expression in simplified radical form. show all steps and work including any foil method work. (hint: use the conjugate. no decimal answers.) (9-2√3)/(12+√3)

F(x)=x/2-2 and g(x)=2x^2+x-3 find (f+g)(x)