Write an inequality to represent: ten is no more then four then a number

Find the number of positive three-digit even integers whose digits are among 9, 8, 7,5, 3, and 1.

Elizabeth claims that the fourth root of 2 can be expressed as 2^m since (2^m)^n = 2. find the values of m and n for the case where elizabeth's claim is true.

What is the value of x in the equation 1.5x+4-3=4.5(x-2)?