Use Cavalieri’s Principle to calculate the exact volume of an oblique cylinder with a radius of 15 meters and a height of 12 meters.

You are a clerk at convenience store. a customer owes 11.69 for a bag of potatoes chips. she gives you a five dollar bill. how much change should the customer receive?

Sasha drank 8 bottles of water everyday for a week. how many bottles of water did she drink in total?

Use mathematical induction to prove the statement is true for all positive integers n, or show why it is false. 1^2 + 4^2 + 7^2 + + (3n - 2)^2 = [n(6n^2-3n-1)/2]