Establish the identity.sin
= -cos ?
What will be an ideal response?
sin 
= sin 
cos ? - cos 
sin ? = (-1) ? cos ? - 0 ? sin ? = - cos ?
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Answer the question(s) based on the following situation: Over the last 80 years records have been kept of the annual rainfall in the Tasmanian desert. The distribution of annual rainfall is approximately normal and has no outliers. The minimum of 4.5 inches of rain occurred in 1952; the maximum of 11.7 inches of rain occurred in 1934.Two years ago, the annual rainfall was 7.5 inches. The standardized value corresponding to this rainfall is approximately
A. 1. B. 2.5. C. -0.5. D. 0. E. none of these
Solve the problem.For a culture of 70,000 bacteria of a certain strain, the number of bacteria N that will survive x hours is modeled by the formula N = 7000
. After how many hours will 21,000 bacteria survive?
A. 97 hr B. 91 hr C. 9 hr D. 79 hr
Find A-1 if it exists.A = 
A. 
B. 
C. 
D. Does not exist
Solve the problem.An exam consists of 9 multiple-choice questions and 6 essay questions. If the student must answer 5 of the multiple-choice questions and 3 of the essay questions, in how many ways can the questions be chosen?
A. 2520 B. 261,273,600 C. 810 D. 1,814,400