Brad bought a skateboard for $2 less than half its original price. if he paid $21.50, which skateboard did he buy?
a. go green: $45
b. speedster: $47
c. up and down: $43
d. with the flow: $41

Combine like terms to make a simpler expression 3z+z

Can someone me with my math problems i have a bunch. i will give brainliest and lots of pleeeaaasssee

Arestaurant offers delivery for their pizzas. the total cost the customer pays is the price of the pizzas, plus a delivery fee. one customer pays $23 to have 2 pizzas delivered. another customer pays $59 for 6 pizzas. how many pizzas are delivered to a customer who pays $86?