Use a sum-to-product identity to rewrite the expression.cos 11° - cos 34°
A. -2 sin 22.5° sin (-11.5°)
B. -2 sin 22.5° cos (-11.5°)
C. -2 cos 22.5° cos (-11.5°)
D. -2 cos 22.5° sin (-11.5°)
Answer: A
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Evaluate the line integral of f(x,y) along the curve C.f(x, y) = x2 + y2, C: y = 3x + 2, 0 ? x ? 3
A. 156
B. 52
C. 336
D. 156
New telephone lines must be installed to connect 9 cities (A, B, C, D, E, F, G, H and J). Due to government regulations, the only possible connections that are allowed are shown by the edges on the network below. The numbers on the edges indicate the cost (in millions of dollars) of each possible connection. The telephone company wishes to connect the cities in the cheapest possible way.
In an optimal solution to this problem there will not be a direct connection between
A. E and F. B. B and C. C. E and H. D. C and J. E. all of these will be directly connected.
Solve the problem.The perimeter of a rectangle is 64 m. If the width were doubled and the length were increased by 5 m, the perimeter would be 100 m. What are the length and width of the rectangle?
A. Length: 19 m; width: 13 m B. Length: 16 m; width: 11 m C. Length: 13 m; width: 19 m D. Length: 16 m; width: 16 m
Graph the function.y = 
ex
A. 
B. 
C. 
D. 