Solve the problem.Suppose a tank contains 100 gallons of a solution of 10 lb of salt dissolved in water, which is kept uniform by stirring. Pure water is allowed to flow into the tank at a rate of 3 gallons per minute, and the mixture flows out at a rate of 2 gallons per minute. How long will it take for the amount of salt in the mixture to be reduced to 4.5 lb?
A. Approx. 89 min
B. Approx. 69 min
C. Approx. 49 min
D. Approx. 35 min
Answer: C
Mathematics
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Find the slope and the y-intercept of the given line.5x + 7y = 48
A. -1
; 
B. 
; 
C. - 
; 
D. 1
; 
Mathematics
Solve the problem.Find the perimeter of an isosceles trapezoid with short base of 34.2 cm, long base of 
and height of 
A. 179.6 cm B. 145.5 cm C. 145.2 cm D. 145.8 cm
Mathematics
Solve the equation.2
= y
A. {0} B. {0, 2} C. {4} D. {0, 4}
Mathematics
Write an expression that illustrates the intermediate steps required to mentally perform the specified computation using adjustment.68 + 33
A. 60 + 30 + 10 - 1 B. 60 - 30 + 11 C. 60 + 30 + 11 D. 68 + 2 + 33 - 2
Mathematics