Write the 2-digit number that matches the clues my number has a tens digit that is 8 more than the ones digit. zero is not one one of my digits

How do you use the elimination method for this question? explain, because i really want to understand!

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.

Jake bakes and sell apple pies. he sells each pie for $5.75 . the materials to make the pies cost $40. the boxes jake puts the pies in cost & 12.50 total. how many pies does jake need to sell to earn a profit of $50