solve 4(3)+5(6+1) wut is dis

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

Adam drew two same size rectangles and divided them into the same number of equal parts. he shaded 1/3 of one rectangle and 1/4 of the other rectangle. what is the least number of parts into which both rectangles could be divided into?

Emily is entering a bicycle race for charity. her mother pledges $0.90 for every 0.75 mile she bikes. if emily bikes 18 miles, how much will her mother donate?