Need with this. type the correct answer in the box.

Lois and clark own a company that sells wagons. the amount they pay each of their sales employees (in dollars) is given by the expression 12h+30w12h+30w where hh is the number of hours worked and ww is the number of wagons sold.

Which expression is equivalent to (3^2)^-2 a.-81 b.-12 c.1/81 d.1/12

Suppose a pendulum is l meters long. the time,t,in seconds that it tales to swing back and forth once is given by t=2.01