Solve the problem.A tank contains 2000 L of a solution consisting of 50 kg of salt dissolved in water. Pure water is pumped into the tank at the rate of 10L/s, and the mixture (kept uniform by stirring) is pumped out at the same rate. How long will it be until only 5 kg of salt remain in the tank?
A. approximately 460 seconds
B. approximately 703 seconds
C. approximately 276 seconds
D. approximately 689 seconds
Answer: A
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Use the position equation 
, where 
represents the height of an object (in feet), 
style="vertical-align:middle;" /> represents the initial velocity of the object (in feet per second), 
represents the initial height of the object (in feet), and t represents the time (in seconds).
A projectile is fired straight upward from ground level 
with an initial velocity of 176 feet per second. At what instant will it be back at ground level?
?
A. 
Sec
B. 
Sec
C. 
Sec
D. 
Sec
E. 
Sec
Find the derivative of y with respect to x, t, or ?, as appropriate.y = ln (x - 9)
A. 
B. 
C. - 
D. 
Graph each system of inequalities and shade the portion on the graph represented by the solution set.x + y ? 2 y ? 2
A. 
B. 
C. 
D. 
Find the x- and y-intercepts. If no x-intercepts exist, state so.y = -x2 + 19x - 90
A. No x-intercepts, (0, 9) B. (9, 0), (10, 0), (0, -90) C. (9, 0), (10, 0), (0, 9) D. (-9, 0), (-10, 0), (0, -90)