Solve the variation 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 18 minutes requires 10.8 gallons of water. Find the amount of water used in a shower lasting 7 minutes.
A. 126 gallons
B. 3.6 gallons
C. 4.8 gallons
D. 4.2 gallons
Answer: D
Mathematics
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Solve the proportion.
Mathematics
Find the equation of the parabola whose vertex and focus are shown.
A. (y + 2)2 = 20(x - 1) B. (x + 2)2 = -20(y - 1) C. (y + 2)2 = -20(x - 1) D. (x + 2)2 = 20(y - 1)
Mathematics
Find the shaded area in each figure.
A. 520 m2 B. 860 m2 C. 1540 m2 D. 1880 m2
Mathematics
Factor completely. If the polynomial is prime, say so.3x2 + x - 4
A. (3x + 1)(x - 1) B. (3x + 4)(x - 3) C. (3x + 4)(x - 1) D. (3x - 4)(x + 1)
Mathematics