Plz i am really stuck on this question

Which graph has figures that can undergo a similarity transformation to justify that they are similar? (obviously not the third one)

The difference of three and the reciprocal of a number is equal to the quotient of 20 and the number. find the number.

5. (04.07)which of the following exponential functions goes through the points (1, 12) and (2, 36)? (2 points)f(x) = 3(4)^xf(x) = 4(3)^-xf(x) = 3(4)^-xf(x) = 4(3)^x