Use the Half-angle Formulas to find the exact value of the trigonometric function. cos
A. 
B. 
C. 
D. 
Answer: D
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Solve the problem. Round results to an appropriate number of significant digits.From a balloon 1185 ft high, the angle of depression to the ranger headquarters is 51°38'. How far is the headquarters from a point on the ground directly below the balloon (to the nearest foot)?
A. 943 ft B. 938 ft C. 933 ft D. 928 ft
Simplify.-|-12|
A. -12
B. - 
C. 12
D. 24
Solve the problem.Residents of a certain county can use the expression (v × 0.5548 - 4950) ÷ 1000 × 30.60to determine their property taxes, where v is home value. Use the expression to calculate the amount of property taxes to the nearest dollar that the owner of a home with a value of 
would pay. Follow the order of operations.
A. $3074.14 B. $307 C. $306,570 D. $308,626
Solve the problem.A searchlight is shaped like a paraboloid of revolution. If the light source is located 5 feet from the base along the axis of symmetry and the opening is 8 feet across, how deep should the searchlight be?
A. 1.6 ft B. 4 ft C. 0.8 ft D. 3.2 ft