Can someone help me with my math my teacher is getting on my nerves

Acomputer store bought a program at a cost of $10 and sold it for $13. find the percent markup

Olive's solar powered scooter travels at a rate of 30 miles per hour. what equation can she use to calculate her distance with relation to the time she traveled? h=hours m=miles 1. h=m+30 2. m=30h 3. m=h+30 4. h=30m

At noon a tank contained 10cm water. after several hours it contained 7cm of water. what is the percent decrease of water in the tank?