Solve the problem.Suppose the lengths of the sides of a triangle are a, b, and c as illustrated in the figure. 
If the semiperimeter of the triangle is s = 
(a + b + c), then the area of the triangle is A = 
.Find the area of the triangle with sides a = 20, b = 44, and c = 56. Give the exact answer and then the answer rounded to the nearest hundredth.
A. 160
sq units, 391.92 sq units
B. 80
sq units, 195.96 sq units
C. 40
sq units, 97.98 sq units
D. 320
sq units, 554.26 sq units
Answer: A
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Solve the problem. Write the answer in lowest terms.Mr. Roberts installed 
-inch thick laminated material on top of 
thick plywood to make a countertop. What was the thickness of the completed countertop?
A. 
inch
B. 
inch
C. 
inch
D. 
inch
Simplify the radical. Assume that all variables represent positive real numbers.
A. 
B. 
C. 
D. 
Solve the problem.A flare fired from the bottom of a gorge is visible only when the flare is above the rim. If it is fired with an initial velocity of 208 ft/sec, and the gorge is 672 ft deep, during what interval can the flare be seen? (h = -16t2 + vot + ho.)
A. 12 < t < 13 B. 0 < t < 6 C. 18 < t < 19 D. 6 < t < 7
Find the opposite of the real number.-12
A. -12
B. - 
C. 12
D. 