Classify the angle as acute, obtuse, straight, or right. For right and straight angles indicate the number of degrees in the angle.
A. Right (90°)
B. Straight (180°)
C. Acute
D. Obtuse
Answer: C
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Evaluate. 72
A. 128 B. 14 C. 64 D. 49
Use the summation properties to evaluate the series. The following rules may be needed: 
.
A. 171
B. 63
C. 
D. 
Express the product as a sum containing only sines or cosines.sin(3?) sin(7?)
A. 
[- cos(4?) - cos(10?)]
B. 
[cos(4?) - cos(10?)]
C. sin2(21?2)
D. 
[cos(10?) - sin(4?)]
Solve the problem.The amount of simple interest earned on an investment over a fixed amount of time is jointly proportional to the principle invested and the interest rate. A principle investment of $2000.00 with an interest rate of 1% earned $100.00 in simple interest. Find the amount of simple interest earned if the principle is $3500.00 and the interest rate is 8%.
A. $1400.00 B. $800.00 C. $140,000.00 D. $175.00