Please help! I have to have this done in 5 minutes! Two students each write a function, S(n), that they think can be used to find the number of squares needed to make the nth figure in the pattern shown.

Use the drop-down menus to explain why each function does or does not represent the number of squares needed to make the nth figure in the pattern.

Shara: S(1) =2
S(n)=S(n-1)•2
“The function (can/cannot) be use to find the number of squares needed to make the nth figure in the pattern. The number of squares needed to make each figure is (one-third/one-half/double/triple) the number of squares used in the previous figure.”

Darren: S(n)=2^n
“This function (can/cannot) be used to find the number of squares needed to make the nth figure in the pattern.

The first figure has 2 squares, and you multiply (1/3,1/2,2,3) each time a figure is added. This repeated multiplication can be represented by an exponent.”