An airplane is flying 2250 feet in the air. a submarine submerged 1300 feet below sea level. what is the difference in elevation between the airplane and the submarine?

Ivan and jeff buy a package of 8 pens for $4.00. ivan wants 5 of the pens, and jeff wants 3.how much should each student pay?

How do you write something in scientific notation?

Money off coupons have been circulated to 300 households. only 2/5 of these were redeemed (used) in the local supermarket to get a free shampoo. what fraction of coupons were unused? (ps: write how you got the answer)