Which kind of proof requires you to prove that all but one of a set of possible alternatives are false?

Explain how to find the gcf of three numbers

The product of a number x and 8

four sisters contributed equally to buy a present for thier father. They receive a 10% discount on the original price of the gift. after the discount was taken each sister paid 13.50. what was the original price of the gift?

Which products result in a perfect square trinomial? Check all that apply. (-x + 9) (-x - 9) (xy + x) (xy + x) (2x - 3) (-3 + 2x) (16 - x2) (x2 - 16) (4y2 + 25) (25 + 4y2)

A survey found that 39% of students in North Carolina Community Colleges come directly from high schools. The local college has a student population of 17,350. How many of these schools would we expect to come directly from a high school?

18 thousands equals Renaming numbers

The length of a rectangle is 6 cm more that it's width. If the area of the rectangle is 27 cm^2, find the dimensions of the rectangle.

If f (a. b) = f (a) + f (b) and f (2) = 3, then f (32) equals how can we get 15 after this f (16) = f (8) + f (2) + f (2) ? what's the next step?

How is 9644 divided by 4

Estimate the area of a circle with a radius of 27 meters. Use 22/7 for pi.