Alexandra needed to get her computer fixed. She took it to the repair store. The technician at the store worked on the computer for 5.25 hours and
charged her $58 for parts. The total was $661.75. Write and solve an equation
which can be used to determine x, the cost of the labor per hour.

Suppose you are choosing a 6-digit personal access code. this code is made up of 4 digits chosen from 1 to 9, followed by 2 letters chosen from a to z. any of these digits or letters can be repeated. find the total number of personal access codes that can be formed. 492,804 341,172 39,917,124 4,435,236