For the given vectors u and v, find the angle between them.u = 
, v = 
A. 0°
B. 35.3°
C. 66°
D. 90°
Answer: B
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Solve the problem.A certain radioactive isotope decays at a rate of 2% per 100 years. If t represents time in years and y represents the amount of the isotope left then the equation for the situation is 
In how many years will there be 94% of the isotope left?
A. 256 years B. 600 years C. 300 years D. 309 years
Solve the problem.Each gallon of shingle stain covers 120 square feet. How many gallons are needed to cover 1080 square feet?
A. 7 gallons B. 8 gallons C. 9 gallons D. 10 gallons
For the given functions f and g, find the requested function and state its domain. Write the domain in interval notation.f(x) = 16 - x2; g(x) = 4 - x;
Find f + g.
A. (f + g)(x) = -x2 - x + 20; (-?, ?) B. (f + g)(x) = 4 + x; (-?, -4) ? (-4, ?) C. (f + g)(x) = x3 - 4x2 - 16x + 64; (-?, ?) D. (f + g)(x) = -x2 + x + 12; (-?, ?)
Find the sum of the arithmetic series using a formula.The first 30 terms of the series whose terms are an = 10 - 3n
A. -1095 B. -995 C. -1295 D. -2190