Atest consists of 20 problems and students are told to answer any 15 of these questions. in how many different ways can they choose the 15 questions?

If you are trying to move an attached term across the equal sign (=), what operation would you use to move it?

Which of the following three dimensional figures has a circle as it’s base

Amountain climber starts a climb at an elevation of 453 feet above sea level at his first rest stop he has climbed 162 feet and by his second rest stop he has climbed another 207 feet its getting late in the day so the climber starts his way down if the climber desends 285 feet how much does he need to ascend or descend to return to the original starting point