A submarine sits at -300 meters in relation to sea level. Then it descends 115 meters. What is its new position in relation to sea level.

Me because some of question i don’t understand

Tom can paint the fence in 12 hours, but if he works together with a friend they can finish the job in 8 hours. how long would it take for his friend to paint this fence alone?

Abowl contained 270 starbursts of all different colors. if the probability of picking a yellow is 1/9, then how many yellow starbursts are in the bowl ? ?