The equation you want to use is 15 (set price) + 6x (x is the number of hours) = total price. The you would have to solve for x. 15+6x=39 -15 -15 6x=24 /6 /6 x= 4 He payed to have the bike checked out for four hours.
Assuming the question is in the wrong format and"date" is data. I chose X= 10,11,16,9,7,15,16,10 and Y= <span>96,51,62,58,89,81,46,51 the correlation cooefficent is -0.3351