A tank originally contains 100 gallons of fresh water. Then water containing 0.25 lbs of salt per gallon is poured into the tank at a rate of 8 gallons per minute, and the mixture is allowed to leave at the same rate. (a) Let A (t) denote the amount of salt in the tank at time t (in minutes). Determine the solution and how much salt there is in the tank in 10 minutes: - (1/1) A (t) = 25-25e A (10) = -(1) 25 - 25e A (t)= 30.67e (b) After 10 minutes the process is stopped, and fresh water is poured into the tank at a rate of 8 gallons per minute with the mixture again leaving at the same rate. Determine the solution A (t) for t > 10 and how much salt there is in the tank in an additional 10 minutes (20 minutes overall): - ( 11 ) X (0 ≤ t ≤ 10 ) lbs ( t > 10 ) lbs A (20) = 30.85 X Note: Use the A (10) as the initial condition rather than A (0)!
A tank originally contains 100 gallons of fresh water. Then water containing 0.25 lbs of salt per gallon is poured into the tank at a rate of 8 gallons per minute, and the mixture is allowed to leave at the same rate. (a) Let A (t) denote the amount of salt in the tank at time t (in minutes). Determine the solution and how much salt there is in the tank in 10 minutes: - (1/1) A (t) = 25-25e A (10) = -(1) 25 - 25e A (t)= 30.67e (b) After 10 minutes the process is stopped, and fresh water is poured into the tank at a rate of 8 gallons per minute with the mixture again leaving at the same rate. Determine the solution A (t) for t > 10 and how much salt there is in the tank in an additional 10 minutes (20 minutes overall): - ( 11 ) X (0 ≤ t ≤ 10 ) lbs ( t > 10 ) lbs A (20) = 30.85 X Note: Use the A (10) as the initial condition rather than A (0)!
Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter5: Inverse, Exponential, And Logarithmic Functions
Section5.6: Exponential And Logarithmic Equations
Problem 64E
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