Help me please i am very lost but i am trying

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?

15 pizzas are cut into 1/8 slices. how many slices of pizza are there?

Find the ordered-pair solution of y=3x-2