Use identities to write the expression as a function of x alone.cos (x + 270°)
A. -sin x
B. cos x
C. sin x
D. -cos x
Answer: C
Mathematics
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Using Green's Theorem, find the outward flux of F across the closed curve C.F =(x2 + y2)i + (x - y)j ; C is the rectangle with vertices at (0, 0), (1, 0), (1, 10), and 
A. -90 B. 20 C. 110 D. 0
Mathematics
Divide.
A. 24 B. 5k C. 24k2 D. 5k2
Mathematics
Solve the problem.A certain radioactive isotope has a half-life of approximately 1800 years. How many years would be required for a given amount of this isotope to decay to 60% of that amount?
A. 1327 yr B. 2379 yr C. 720 yr D. 1267 yr
Mathematics
Determine the amplitude or period as requested.Period of y = cos 3x
A. 
B. 1
C. 3
D. 2?
Mathematics