Hello, can someone help with these problems. Simplify:
3x+9-4x
2(3-4x)+5
(3x+5)- 2(8x+3)
(2x+3y-4) - (3x+5y+6)
3(2x-4y+8) -5x -4
Thx!!

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?

The table shows the height in feet of several students in miss patel’s class

Hannah has 5 more than twice the number of baseball cards that leo has. if leo has x cards, which expression shows the number of baseball cards hannah has?