1. A piece of equipment consumes c cents per hour of fuel and requires d dollars per hour for other operational costs. What is the cost in dollars of operating the equipment for 700  hours?   7 c + 700 d   7 (c + d)   700 (c + d)   700 c + 7 d   0.01 c + d   Hint Half-n-half Clue   2. If 7 x + 5 y = 49 then 35 x + 25 y is equal to   none of these   294   343   49   245   Half-n-half Clue   3. A university has 3000 graduate students. The number of undergraduate students is 8  / 7  times the number of graduate students. What fraction of the students in the university are undergraduates?   15 / 8   8 / 15   8 / 7   15 / 7   7 / 15   Half-n-half Clue   4. A large water reservoir has two outlet pipes, a small one and a large one. It takes 8  hours to empty the reservoir when only the small outlet pipe is open. It takes 2  hours to empty the reservoir when only the large outlet pipe is open. About what fraction of the reservoir will be emptied in one hour if both the pipes are open?   cannot be determined   0.62   0.12   0.50   0.38   Half-n-half Clue