Solve the problem.The area of a circle of radius r is given by the polynomial ?r2, where ? is an irrational number. Use 3.14 as an approximation of ?, and find the area of a circle with radius 

A. 192 cm2
B. 50.24 cm2
C. 25.12 cm2
D. 200.96 cm2


Answer: D

Mathematics

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Find the area of the SAS triangle ABC. If necessary, round the answer to two decimal places.a = 12 km, b = 15 km, C = 52°

A. 88.80 sq km B. 141.84 sq km C. 70.92 sq km D. 35.46 sq km

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Solve the equation for solutions in the interval [0, 2?).sec  = cos 

A.
B.
C.
D. {0}

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Find the product. Write the product in rectangular form, using exact values.[7(cos 120° + i sin 120°)] [2(cos 90° + i sin 90°)]

A. 5 - i
B. -7 - 7 i
C. 7 - 28 i
D. 14 - 14i

Mathematics

Find the vertex of the parabola.y = x2 + 6x + 10

A. (1, -3) B. (-1, 3) C. (-3, 1) D. (3, -1)

Mathematics