Which one is correct please hurry <3

(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?

Carlos spent 1 1/4 hours doing his math homework he spent 1/4 of his time practicing his multiplication facts how many hours to carlos been practicing his multiplication facts

The cost of using a service is $0.25 per min. what equation correctly represents the total cost c, in dollars, for d days of use?