Jake spent 3/4 of an hour each 2 days working on his science project kyile spent 1/4 of an hour of each 6 days working on his science project who spent the most time total working on on his project

To find out the total time Jake and Kyile spent working in their project we have to make a multiplication of the time spent and the days they did it:
jake = (3/4)*2 = 6/4 = 3/2
so Jake spent 3/2 hours working in his project, that is 1.5 hours

kyile = (1/4)*6 = 6/4 = 3/2

Therefore they worked the same amount of hours!

C. i believe it is (5×(-20))+(100×(0.7))