Solve the problem.A tank initially contains 100 gal of brine in which 40 lb of salt are dissolved. A brine containing 
of salt runs into the tank at the rate of 4 gal/min. The mixture is kept uniform by stirring and flows out of the tank at the rate of 3 gal/min. Find the solution to the differential equation that models the mixing process.
A. y = 4(50 + t) - 
B. y = 4(50 + t) - 
C. y = 2(100 + t) - 
D. y = 2(100 + t) - 
Answer: C
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The measures of two angles of ABC (shown in the illustration) are given. Find the measure of the third angle, if
m(?A) = 130.3º and m(?B) = 40.3º.
A. 8.4º B. 9.4º C. 19.41º D. 9.51º E. 9.3º
Solve the problem.A boat goes 120 miles downstream in the same time it can go 90 miles upstream. The speed of the current is 4 miles per hour. Find the speed of the boat in still water.
A. 24 mph B. 28 mph C. 21 mph D. 32 mph
Subtract.89,968
A. 89,623 B. 88,613 C. 88,623 D. 88,533
Find the missing parts of the triangle. Round to the nearest tenth when necessary or to the nearest minute as appropriate.C = 112.9°a = 8.4 kmb = 11.3 km
A. c = 16.5 km, A = 28°, B = 39.1° B. c = 22.3 km, A = 26°, B = 41.1° C. c = 19.4 km, A = 30°, B = 37.1° D. No triangle satisfies the given conditions.