If an investment has a goal (future value) of $S after n years, invested at interest rate i (as a decimal), compounded annually, then the present value P that must be invested is given by 
. Find P for the given S, n, and i. Round your answer to two decimal places.
?
$18,000 after 10 years at 11.25%
?
A. $5,457.03
B. $12,542.97
C. $6,198.3
D. $7,671.36
E. $11,801.7
Answer: C
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Find the unit tangent vector of the given curve.r(t) = (10t cos t - 10 sin t)j + (10t sin t + 10 cos t)k
A. T = (10 cos t)j - (10 sin t)k
B. T = (-10 sin t)j + (10 cos t)k
C. T = (-sin t)j + (cos t)k
D. T = - 
(sin t)j + 
(cos t)k
Solve the problem.The city bridge has 6 lanes, all carrying equal numbers of cars. If 252 cars drive across the bridge, how many cars cross in each lane?
A. 42 cars B. 48 cars C. 258 cars D. 43 cars
Find the focus and directrix of the parabola with the given equation.x2 = 5y
A. Focus: (0, 5), directrix: y = - 5
B. Focus: 
, directrix: y = - 
C. Focus: 
, directrix: x = - 
D. Focus: 
, directrix: y = 
Is the set of ordered pairs a function?
?
?
A. function B. not a function