Solve the problem.The amount of water used to take a shower is directly proportional to the amount of time that the shower is in use. A shower lasting 21 minutes requires 10.5 gallons of water. Find the amount of water used in a shower lasting 5 minutes.
A. 105 gal
B. 2.5 gal
C. 3 gal
D. 2 gal
Answer: B
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Write the equation in standard form.y = (x + 8)2
A. y = x2 + 16x + 64 B. y = x + 64 C. y = x2 + 8x + 64 D. y = x2 + 64
Solve the problem.A boat is 60 feet from the base of a cliff. If the distance from the top of the cliff to the boat is 15 feet less than twice the height of the cliff to the water, what is the height of the cliff? Round to the nearest tenth of a foot, if necessary.
A. 75 feet B. 25 feet C. 45 feet D. 35 feet
Use a formula to write an equation for each problem, then solve it.A square plywood platform has a perimeter which is 9 times the length of a side, decreased by 15. Find the length of a side.
A. length of side = 8 units B. length of side = 1 unit C. length of side = 3 units D. length of side = 5 units
Solve using matrices. x + y = 4
A. (8, 4, 11) B. (0, 4, 6) C. (0, -4, 3) D. (0, 4, 3)