Solve.The amount of water used to take a shower varies directly as the amount of time that the shower is in use. A shower lasting 20 minutes requires 10 gallons of water. Find the amount of water used in a shower lasting 4 minutes.
A. 50 gallons
B. 2 gallons
C. 8 gallons
D. 2.5 gallons
Answer: B
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Subtract.(3.9x3 - 7.7x2 - 3) - (8.1x3 - 2.3x2 + 1)
A. -4.2x3 - 5.4x2 - 4 B. -4.2x3 - 10x2 - 4 C. 12x3 - 5.4x2 - 4 D. -4.2x3 - 5.4x2 + 4
Solve the problem.A tank initially contains 120 gal of brine in which 60 lb of salt are dissolved. A brine containing 3 lb/gal of salt runs into the tank at the rate of 9 gal/min. The mixture is kept uniform by stirring and flows out of the tank at the rate of 7 gal/min. Write, in standard form, the differential equation that models the mixing process.
A. 
+ 
y = 27
B. 
= 27 - 
y
C. 
+ 
y = 21
D. 
+ 
y = 27
Let ? be an acute angle. Find the unknown trigonometric value using the given information.tan ? if cot ? = 9
A. 
B. 
C. 
D. 
Multiply.29.4 × 8.8
A. 259.82 B. 38.2 C. 258.83 D. 258.72