If A denotes the area of the sector of a circle of radius r formed by the central angle ?, find the missing quantity. If necessary, round the answer to two decimal places.? = 60°, A = 100 square meters, r = ?
A. 157 m
B. 6.26 m
C. 13.82 m
D. 39.25 m
Answer: C
Mathematics
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A. 22,000,000 B. 21,882,000 C. 21,000,000 D. 21,900,000
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Write the digit for the given place value in the whole number.78,523thousandstens
A. thousands 8 tens 7 B. thousands 8 tens 2 C. thousands 2 tens 3 D. thousands 5 tens 3
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Factor completely. If a polynomial cannot be factored, say it is prime.81a3 - 49a
A. a(9a - 7)2 B. a(9a + 7)(9a - 7) C. (9a2 + 7)(9a - 7) D. a(81a + 1)(a - 49)
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Use the fact that the trigonometric functions are periodic to find the exact value of the expression. Do not use a calculator.sin 
A. - 
B. -1
C. - 
D. 
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