What is the value of the expression 30n when n=2

What is the difference between the points (4, 7) and (4, -5)? a. 0 units b. 2 units c. 4 units d. 12 units

Jenisey has $24 to spend on seven pencils. after buying them she had $10. how much did each pencil cost.?

Acoin bank containing only dimes and quarters has 12 more dimes than quarters. the total value of the coins is $11. how many quarters and dimes are in the coin bank?