If you are able to answer this can u please explain too so i can understand ?

(01.04 mc) an ice sculpture is melting because of heat. assuming its height changes bynegative 5 over 32m every hour, what will be the change in height after 4 hours?

Ben is three times as old as samantha, who is two years older than half of michel's age. if michel is 12. how old is ben?

Ineed with number 6 , explain how to get 1978