Solve the problem.The voltage E in an electrical circuit is given by E = 5.7 cos 40?t, where t is time measured in seconds. Find the frequency of the function (that is, find the number of cycles or periods completed in one second).
A. 20
B. 
C. 
D. 40
Answer: A
Mathematics
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Use differentiation to determine whether the integral formula is correct.
dx = - 
+ C
A. Yes B. No
Mathematics
Use Pascal's triangle to expand the binomial.(x + 2)5
A. x5 + 10x4 + 40x3 + 80x2 + 80x + 2 B. x5 + 10x4 + 40x3 + 80x2 + 80x + 32 C. x5 + 10x4 + 80x3 + 160x2 + 80x + 32 D. x5 + 10x4 + 80x3 + 160x2 + 80x + 2
Mathematics
Graph the equation.x2 + y - 3 = 0
A. 
B. 
C. 
D. 
Mathematics
Approximate the area under the curve and above the x-axis using n rectangles. Let the height of each rectangle be given by the value of the function at the right side of the rectangle.f(x) = 2x + 3 from x = 0 to x = 2; n = 4
A. 11 B. 15 C. 13 D. 17
Mathematics