A company introduces a new product on a trial run in a city. They advertised the product on television and found the percentage P of people who bought the product after t ads had run satisfied the function 
(a) What percentage buys the product after the ad has been been run 1 time, 5 times, 20 times?
(b) Find the rate of change P?(t )
(c) Sketch a graph of the function.
(a) 6.03%; 14.86%; 88.12%
(b) 
(c) 
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Use Descartes's Rule of Signs to determine the possible number of positive and negative real zeros for the given function.f(x) = -7x9 + x7 - x2 + 3
A. 3 or 1 positive zeros, 3 or 1 negative zeros B. 3 or 1 positive zeros, 2 or 0 negative zeros C. 2 or 0 positive zeros, 2 or 0 negative zeros D. 2 or 0 positive zeros, 3 or 1 negative zeros
Solve the problem.Suppose you invest $P on a CD paying 3.375% interest compounded continuously for a term of 100 days. At the end of the term you get $10,092.89 from the bank. Find the value of the original principal P. Round your answer to the nearest dollar.
A. $9995 B. $10,025 C. $10,125 D. $9975 E. $10,000
Simplify the algebraic expression.6x + 8(y + 3) + 7
A. 6x + 8y + 31 B. 14xy + 17 C. -2xy + 31 D. 6x + 8y - 17
Decide whether the dose is reasonable or unreasonable. If it is unreasonable, indicate whether it is too much or too little.Take an aspirin weighing 0.004 milligrams.
A. Reasonable B. Unreasonable, too much C. Unreasonable, too little