Add and subtract as indicated. Simplify and leave the numerator and denominator in your answer in factored form.
+ 
- 
A. 
B. 
C. 
D. 
Answer: C
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Find the measure of the missing angle.
A. 63° B. 27° C. 117° D. 153°
If r(t) is the position vector of a particle in the plane at time t, find the indicated vector.Find the acceleration vector.r(t) = (7 cos t)i + (6 sin t)j
A. a = (-7 cos t)i + (-6 sin t)j B. a = (-7 sin t)i + (-6 cos t)j C. a = (7 sin t)i + (6 cos t)j D. a = (7 cos t)i + (6 sin t)j
Find the linearization of the function at the given point.
at 
A. 
B. 
C. 
D. 
Solve the problem.The consumption of electricity can be modeled by C = Aert, where A is the current use, r is the rate at which the use is increasing, and t is the number of years. Suppose the consumption of electricity grows at 6.8% per year. Find the number of years before the use of electricity has tripled. Round the answer to the nearest hundredth.
A. 1.62 years B. 44.12 years C. 0.16 year D. 16.16 years