12. Erma has her eye on two sweaters at her favorite clothing store, but she has been waiting
for the store to offer a sale. This week, the store advertises that all clothing purchases,
including sweaters, come with an incentive: 25% off a second item of equal or lesser value.
One sweater is $50 and the other is $44. If Erma purchases the sweaters during the sale,
what will she spend?
a. $79
b. $81
c. $83
d. $85

answer: #1 ads up by 8 and i don't know #2

step-by-step explanation:

assume that you have 3 different side lengths.   apply the pythagorean theorem here:   square each of the two shortest sides; call them a and b, so that their squares are a² and b².   also square the longest side, calling the result c².

now, if a² + b² = c² is true, the triangle is a right triangle; otherwise it is not a right triangle.