I need to Simplify (3mn)^4

What is the solution to the equation in the & show work i’m very

What is the axis of symmetry of the function f(x)=-(x+ 9)(x-21)

List x1, x2, x3, x4 where xi is the left endpoint of the four equal intervals used to estimate the area under the curve of f(x) between x = 4 and x = 6. a 4, 4.5, 5, 5.5 b 4.5, 5, 5.5, 6 c 4.25, 4.75, 5.25, 5.75 d 4, 4.2, 5.4, 6