D= rt solve for d, if r = 30 and t = 2 i don't understand how to do this

Which represents the inverse of the function f(x) = 4x? h(x) = x + 4 h(x) = x – 4 h(x) = x h(x) = x

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

Jack has a piece of red ribbon that is two times as long as his piece of blue ribbon. he says that he can use two different equation to find out how long his piece of red ribbon is compared to his piece of blue ribbon is. is he correct? explain his reasoning