Which statement is true?

- all rectangles are squares.
- all parallelograms are rectangles.
- all parallelograms are quadrilaterals.
- all quadrilaterals are parallelograms.

Ithink i know it but i want to be sure so can you me out ?

Which equation represents a direct linear variationa. y=x2b. y=2/5xc. y=1/xd. y=x+3

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?