A tank is 20% full contains 500 gallons of water. Find the maximum capacity of the water tank?PLease HELP ASAP

15 point ! ~ see if you know the answer to both you!

1c) the number 131 is a term in the sequence defined by the explicit rule f(n)=5n-4. which term in the sequence is 131? 2a) write the first four terms of the function f(n)=n^2-1 2b) what is the 10th term of the sequence defined by the explicit rule f(n)=n^2-1 2c) the number 224 is a term in the sequence defined by the explicit rule f(n)=n^2-1. which term in the sequence is 224?

The tile along the edge of a triangular community pool needs to be replaced? ?