Help anyone please.

Find the sum of the measure of the interior angles of a polygon of 9 sides ; of 32 sides

Ascientist has 50 grams of a radioactive element. the amount of radioactive element remaining after t days can be determined using the equation (1) after two days the scientist receives a second shipment of 50 grams of the same element. the equation used to represent the amount of shipment 2 remaining after t days is 10) - 50 which of the following is an equivalent form of the expression for the amount remaining in shipment 2? what’s the answer?

Solve the equation. 2x - 8(x+1)= 6(2x - 3)