Use even and odd properties of the trigonometric functions to find the exact value of the expression.cos (-150°)
A. 
B. 
C. - 
D. - 
Answer: C
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Find the volume of the described solid.The base of a solid is the region between the curve y = 3cos x and the x-axis from x = 0 to x = ?/2. The cross sections perpendicular to the x-axis are isosceles right triangles with one leg on the base of the solid.
A. 
?
B. 2?
C. 
?
D. 
?
Write the sentence as an equation. Let the variable x represent the number.The sum of twice a number and 8 is 14.
A. 2x - 8 = 14 B. x + 16 = 14 C. 16x = 14 D. 2x + 8 = 14
Solve the problem.One meter is about 3.3 ft. Use this information to determine the equivalent of 23 square meters in square feet.
A. 2.11 ft2 B. 250.47 ft2 C. 75.9 ft2 D. 151.8 ft2
Solve the problem.A collection of dimes is arranged in a triangular array with 11 coins in the base row, 10 in the next, 9 in the next, and so forth. Find the value of the collection.
A. $3.30 B. $0.66 C. $13.20 D. $6.60