Why does it not matter what letter or symbol is used to find an unknown number?

Jordan and Paul are brothers that share a bathroom. Jordan took 1 hour to clean the bathroom last week and Paul took 1.5 hours to clean the bathroom this week.

Suppose that 75 percent of the people in a certain metropolitan area live in the city and 25 percent in the suburbs.

Find the first term of the following geometric sequence: , 15, 45, 135, 405,

What is the area of a rectangle that is 178 cm long and 86 cm wide?

Each month, Ellie spends 4 hours in tap class at her dance studio. If each month she spends 20% of her class time in tap class, what is the total number of hours she spends in dance classes each month? Explain or show how you find your answer.

Solve the equation by factoring x^2-7x+12=0

Solve each inequality. check your solution 2 (y-2) >-4+2y

If h = mv-l+h than mv+l-h=

A cup of cereal can contain 480 milligrams of salt, which is 20% of the recommended daily amount. What is the recommended daily amount of salt?

Think About the Process At a little-known vacation spot, taxi fares are a bargain. A 63-mile taxi ride takes 72 minutes and costs $50.40. You want to find the cost of a 42-mile taxi ride. What unit price do you need?