Use the identities for the cosine of a sum or a difference to write the expression as a single function of ?.cos (? + 90°)
A. cos ?
B. sin ?
C. -sin ?
D. -cos ?
Answer: C
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Solve the problem.The table contains data that can be modeled by an exponential function of the form 
Use regression to determine an exponential function f that models this data. Round the coefficients to the nearest hundredth.
A. f(x) = (1.32)(5.97)x B. f(x) = (1.78)(1.63)x C. f(x) = (5.97)(1.32)x D. f(x) = (1.63)(1.78)x
Simplify the expression by combining like terms.-1.2x3 - 1.5x3 - 0.4x3
A. -4.3x3 B. -15x3 C. Cannot be simplified D. -3.1x3
Provide an appropriate response.The net price equivalent rate is the complement of a trade discount series.
A. True B. False
Solve the problem.A(x) = -0.015x3 + 1.05x gives the alcohol level in an average person's bloodstream x hours after drinking 8 oz of 100-proof whisky. If the level exceeds 1.5 units, a person is legally drunk. Find the rate of change of alcohol level with respect to time when x = 2 hours.
A. 0.87 units/hr B. 1.92 units/hr C. 0.99 units/hr D. 1.23 units/hr