Question 35932
The formula they gave you is g(x)= 2x+3, and it is read "g of x equals 2x+3".  Then they give you g(9), which means that the number 9 represents the value of x.  It means to substitute 9 in place of the x (or all the x's if there had been more x's!), and simplify.  It looks like this:


g(x) = 2x+3

g(9) = 2(9) +3
g(9) = 18+3= 21


R^2 at SCC