Why do perfect squares only end up with certain numbers in the last place?

A box of uncooked spaghetti costs $0.1369 per ounce how much is this cost to the nearest cents

Solve 2/5+1/4+7/10 = in simplest form

A piano has 52 white keys. Write and use an equation to find the number of octaves (8 keys) on a piano keyboard.

Amari is standing 50 feet from the base of a building. from where he stands, the angle formed from the top of the building to where he stands is 60 degrees. how tall is the building?

Consider the extremely large integers $$x = 2/cdot 3/cdot 5/cdot 7/cdot 11/cdot 13/cdot 17/cdot 19/cdot 23/cdot 29$$ and $$y = 29/cdot 31/cdot 37/cdot 41/cdot 43/cdot 47/cdot 53/cdot 59/cdot 61/cdot 67.

For his birthday party, Perry mixed together 3 gallons of Jackson's fruit punch, and 2 gallons of Bonanza's fruit punch. Jackson's fruit punch contains 20% fruit juice, and Bonanza's fruit punch contains 55% fruit juice.

Your parents allow you to borrow a car to get to your part-time job, but you have to pay for a tank of gas each month. Gasoline costs $2.76/gallon and the tank takes 15 gallons.

You are a sales specialist at a company that makes copper wire. You use the formula (cost in dollars) = 0.09 * (length in feet) to calculate the cost of #8 copper wire.

At the fair, you spend $6 for food, then use the rest of your $20 to buy ride tickets. You have enough money to buy 56 tickets. How much does each ticket cost? a. $ 0.20 c. $0.35 b. $0.25 d. $ 0.48

The Pizza Place surveyed a random 50 people in their community about their favorite pizza type. Of those surveyed, 27 said that mushroom was their favorite type of pizza.