Solve the problem.Suppose that for an electrical appliance, voltage is given by 
and amperage by 
where t is time in seconds. Use identities to write the wattage 
in the form 
A. W = - 101.115 cos 240?t + 101.115
B. W = 101.115 cos 240?t - 101.115
C. W = - 202.23 cos 240?t+ 202.23
D. W = - 101.115 cos 120?t + 101.115
Answer: A
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A. 1,438 ft/sec B. 177.9 ft/sec C. 1,092 ft/sec D. 176.6 ft/sec
Provide an appropriate response.The solution of the equation 5(4s - 3) = 20s - 15 is given as 0. Is this correct? Explain.
What will be an ideal response?
If r is a positive number and the point (x, y) is in the indicated quadrant, decide whether the given ratio is positive or negative.II, 
A. Positive B. Negative
Factor the expression completely, if possible.z3 + 343
A. (z + 7)(z2 - 7z + 49) B. (z + 7)(z2 + 49) C. (z - 7)(z2 + 7z + 49) D. (z - 343)(z2 - 1)