Write the fractions that represent the shaded and unshaded portions of the given figure.
A. 
, 
B. 
, 
C. 
, 
D. 
, 
Answer: D
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Solve the problem.A boat is towed toward a dock by a cable attached to a winch that stands 15 ft above the water level (see figure). Let ? be the angle of elevation of the winch and let z be the length of the cable as the boat is towed toward the dock. Compute 
when 
A. 
= -0.00030
B. 
= -0.00418
C. 
= -0.26287
D. 
= -0.00446
Solve the problem.If the three lengths of the sides of a triangle are known, Heron's formula can be used to find its area. If a, b, and c are the three lengths of the sides, Heron's formula for area is: A = 
where s is half the perimeter of the triangle, or s = 
(a + b + c).Use this formula to find the area of the triangle if a = 4 cm, b = 10 cm and c = 12 cm. 
A. 8
sq. cm
B. 3
sq. cm
C. 3
sq. cm
D. 3
sq. cm
Find the best buy (based on cost per unit).Brand A: 15 oz for $7.50Brand B: 12 oz for $5.64
A. Equal value B. Brand B C. Brand A D. Not enough information
Simplify the expression, leaving your answer with only positive exponents. Assume that all variables represent positive numbers.
-1/2
A. 
B. - 
C. - 
D. 