Not super good at understanding surface area yet, someone answer it please.

Find the missing factor. write your answer inexponential form.9^2=9^4×

Right ∆abc has coordinates a(-7, 3), b( -7, 10), and c(-1, 3). the triangle is reflected over the x - axis and then reflected again over the y - axis to create ∆a'b'c'. which are the coordinates of vertex a'?

What is the slope of the line that passes through ( 1,4) and (1,-3)