After beginning antiseptic treatment, the number of bacteria in a population decreases at a rate of 10% per hour, that is, dN/dt = -0.10N, where N is the number of bacteria and t is the time, in hours.
a) When t = 0 , there are 80,000 bacteria present. Find a function that satisfies this equation.
(b) How many bacteria will remain after 24 hr?
(c) After how long do half of the original bacteria remain?
(a) 
(b) 7257
(c) 6.93 hr
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Solve the system.
A. x = -3, y = -3, z = 1, w = -2 B. x = 3, y = -3, z = 1, w = -1 C. x = 3, y = -6, z = -1, w = -1 D. x = 1, y = -1, z = 3, w = -2
Rationalize the numerator.
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What will be an ideal response?
Solve the problem.Use your graphing calculator to find how long it will take for $6600 invested at 
per year compounded daily to triple in value. Find the answer to the nearest year.
A. 2,502,126 years B. 0 years C. 25,219 years D. 19 years
Find the amount of the sales tax or the tax rate and the total cost. Round money answers to the nearest cent.Cost of item: $280 Tax rate: 3%
A. $5.60, $285.60 B. $84.00, $364.00 C. $8.40, $288.40 D. $11.20, $291.20