Ineed to know what the answer is and how to solve it

What is the square root of 45? (step by step working plz)

The measure of one angle of an octagon is two times smaller that of the other seven angles. what is the measure of each angle?

Samantha is growing a garden in her back yard. she spend $90 setting up the garden bed and buying the proper garden supplies. in addition, each seed she plants cost $0.25. a. write the function f(x) that represents samantha's total cost on her garden. b. explain what x represents. c. explain what f(x) represents. d. if samantha plants 55 seeds, how much did she spend in total?