Which expression is equivalent to x^-5/3

What is this inequality notation? t is less then or equal to 2

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

Acompany charges $0.10 for each letter engraved. bobby plans to spend no more than $5.00 on the engraving on a jewelry box. write and solve an inequality to find the maximum number of letters he can have engraved.