Can some one help me out with this please?

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

Which statement about the annual percentage rate (apr) is not true?

Gabriel determined that his total cost would be represented by 2.5x + 2y – 2. his sister states that the expression should be x + x + 0.5x + y + y – 2. who is correct? explain.