Could someone please answer and explain step by step?

The square pyramid has a volume of 441 cubic inches. what is the value of x? 1/7x is the height x is the base

Ten times the square of a non-zero number is eqaul to ninety times the number

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?