Write the complex number in polar form. Express the argument in degrees, rounded to the nearest tenth, if necessary.-15 + 20i
A. 25(cos 126.9° + i sin 126.9°)
B. 25(cos 233.1° + i sin 233.1°)
C. 25(cos 53.1° + i sin 53.1°)
D. 25(cos 306.9° + i sin 306.9°)
Answer: A
Mathematics
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Graph the equation.49y2 - x2 = 49
A. 
B. 
C. 
D. 
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Solve the inequality.x2 - 3x ? 0
A. -3 ? x ? 0 B. x ? -3 or x ? 0 C. x ? 0 or x ? 3 D. 0 ? x ? 3
Mathematics
Simplify the expression.(-39)4
A. Exponent: -39, base: 4 B. Exponent: 4, base: -39 C. Exponent: -4, base: 39 D. Exponent: 4, base: 39
Mathematics
Let s be a real number corresponding to the point (a, b) on the unit circle. Use this information to determine the sine and cosine of the real number.s + ?
A. sin (s + ?) = b, cos (s + ?) = a B. sin (s + ?) = -a, cos (s + ?) = -b C. sin (s + ?) = a, cos (s + ?) = b D. sin (s + ?) = -b, cos (s + ?) = -a
Mathematics