Parallelogram abcd is a rectangle
a (4,3)
b(-2,1)
d(5,0)
6 8
1
c(-1,-2)
what are the slopes of the sides that make this quadrilateral a rectangle?
-2 and 12
-12 and 2
-13 and 3
-3 and 13

The salesperson earns a 5% commission on the first $5,000 she has in sales. the salesperson earns a 7.5% commission on the amount of her sales that are greater than $5,000. this month the sales person had $8,000 in sales. what amount of commission, in dollars, did she earn?