Im dumb so help me out here 50 points each Click on the image to enlarge

Suppose the radius of a circle is 16. what issuppose the radius of a circle is 16. what is its circumference its circumference

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.

For f(x)=2x+3 and g(x)=x^2- 8 find (f+g) (x)