Two snow resorts offer private lessons to their customers. Big time ski mountain charges $5 per hour plus $50 insurance. Powder hill charges $10 per hour plus $30 insurance. For what number of hours is the cost of the lessons the same for each resort?

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