What numbers are irrational. square root of 45, square root of 64, square root of 21 , and square root of 21

Given f(t) = 282 - 53 +1, determine the function value f(2). do not include f(z) = in your answer

Abiologist is recording the loss of fish in a pond. he notes the number of fish, f, in the pond on june 1. on july 1 there were 63 fish in the pond, which is 52 fewer fish than were in the pond on june 1. which equation represents this situation? a. f – 52 = 63 b. f – 63 = 52 c. 63 – f = 52 d. f – 63 = –52

We just started the introduction into circles and i have no idea how to do this.