9is subtracted from the square of a number.

A number will be represented by x. The square of any number is represented as the number raised to the power of 2. Therefore, you'd get x^2.

9 is subtracted from that term. The following expression will be your

the perimeter is increased by a factor of 2

option 1

data plot with   3 dots over 33, 1 dot over 34, 2 dots over 35, no dot over 36, 1 dot over 37, 2 dots over 38, 4 dots over 39, and 2 dot over 40.