I need help with this it is part of my grade and I cannot finds the number until 50 from our system to the mystery system and tell me how you got it

Write the rational number in lowest terms 99/-15

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

Find solution of the linear equation y = 2/3x + 1/3