angel has $54 to buy cds and books. each cd, c, cost $9 and each book, b, cost $6. she wants to buy exactly 7 items. Write a system of equations that could be used to represent this scenario

Which equation and solution can be used to solve this problem? thirteen less than a number is sixteen. 13-n=16: add 13 to both sides. the answer is 29. n+13=16: subtract 13 from both sides. the answer is 3. n+16=13 subtract 13 from both sides. the answer is 3. n-13=16: add 13 to both sides. the answer is 29.

Given the function f(x) = log base 4(x+8) , find the value of f^-1(2)

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