How do you solve 1/3x = 20 to find x

This race was first held in 1953 on august 16th. every decade the race finishes with a festival. how many years is this?

What is the sum of these mixed numbers 2 1/8 + 4 3/8

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?