Someone help with the first one

Use composition to determine if (x) or h(x) is the inverse of f(x) for the limited domain x2-1.

1) you deposit $2,500 in an account that earns 4% simple interest. how much do you earn in eight years?

Mr. thompson took five of his children to the bowling alley the cost for children 12 and older is 350 the cost of four children under 12 inch to 25 he spent a total of 1625 how many of his children are 12 and order