Write the expression as the cosine of an angle, knowing that the expression is the right side of the formula for 
with particular values for ? and ?.cos (170°) cos (50°) + sin (170°) sin (50°)
A. cos (220°)
B. cos (190°)
C. cos (210°)
D. cos (120°)
Answer: D
Mathematics
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Find the exact value of the trigonometric expression without the use of a calculator.cos 
A. 1
B. 
C. 
D. 
Mathematics
Solve the problem.In a local election, 45,000 people voted. This was an increase of 5% over the last election. How many people voted in the last election? Round to the nearest whole number.
A. 47,250 people B. 47,368 people C. 42,857 people D. 42,750 people
Mathematics
Determine whether the equation defines y as a function of x. x + 8y = 4
A. function B. not a function
Mathematics
Solve the problem.Find the volume of the circular cone pictured below. Use 3.14 for ? and round to the nearest whole unit.
A. 63 in.3 B. 188 in.3 C. 283 in.3 D. 377 in.3
Mathematics