If f(x)=x^2 and g(x)=6x+4, which value of x does (f+g)(x)=0

Steve wants to develop a way to find the total cost of any item including sales tax. the sales tax in his city is 6%. his friend jenna writes the expression x + 6x where x is the cost of the item. explain whether her expression is correct based on the situation.

What happens to the area as the sliders are adjusted? what do you think the formula for the area of a triangle is divided by 2?

Hi i’m not sure how to do question 20 if u could explain how to do it that’d b great