What is the factored form of the expression t^2-81 a. ( t + 9 ) ( t - 9 ) b. ( t + 81 ) ( t - 81 ) c. ( t + 9 )^2 d. ( t - 9 )^2 i believe it's a, but i'm not sure. .

Avegetable garden and a surrounding path are shaped like a square together are 12 ft wide. the path is 1 feet wide. if one bag of gravel covers 8 square feet, how manu bags are needed to cover the path? round your answers to the nearest tenth.

What expression is equivalent to (2x-1)(x-3)?

Sum is 17 and their difference is 3