Find the equation of the tangent line at the given point on the curve.2xy - y2 = 1; (1, 1)
A. y = 1
B. y = -x + 1
C. y = x - 1
D. x = 1
Answer: D
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Find the final amount (rounded to the nearest dollar) in this retirement account, in which the rate of return on the account and the regular contribution change over time.$300 per month invested at 6%, compounded monthly, for 15 years; then $700 per month invested at 7%, compounded monthly, for 15 years.
A. About $761,369 B. About $474,476 C. About $470,432 D. About $309,119
Solve the problem.In a town whose population is 3000, a disease creates an epidemic. The number of people, N, infected t days after the disease has begun is given by the functionN(t) = 
. Find the number of infected people after 10 days.
A. 2737 people B. 2000 people. C. 142 people D. 1000 people
Simplify the expression. Assume that all variables are positive when they appear.(9
)(10
)
A. 90
B. 2250
C. 450
D. 450
Graphically approximate the limit (if it exists) by using a graphing utility to graph the function.
?
?
A. 
B.
C.
D.
E.
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