How would you write The difference of 9 and the square of a number

Choose the number sentence that shows the identity property of addition. a. 122 = 61 + 61 b. 62 = 1 + 61 c. 61 = 0 + 61

Which expression and diagram represent “renee biked four times as far this month as last month”?

Can someone show me step by step how to do this?