Multiply.(4- 9r)(4 + 9r)
A. 16 - 72r - 81r2
B. 16 - 81r2
C. 16 - 9r2
D. 16 + 72r - 81r2
Answer: B
Mathematics
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Find zw or 
as specified. Leave your answer in polar form.z = 10(cos 30° + i sin 30°)w = 5(cos 10° + i sin 10°)Find zw.
A. 15(cos 300° + i sin 300°) B. 50(cos 40° + i sin 40°) C. 15(cos 40° + i sin 40°) D. 50(cos 300° + i sin 300°)
Mathematics
Rationalize the denominator and simplify. Assume that all variables represent positive real numbers.
A. 
B. 
C. 
D. 
Mathematics
Use the quadratic formula to find the roots of the equation. Find a decimal approximation to the nearest thousandth.6x2 + 10x + 2 = 0
A. x = -1.847, x = 0.18 B. x = -2.268, x = -1.066 C. x = -1.434, x = -0.232 D. x = -0.717, x = -0.116
Mathematics
Determine whether the given value is a solution of the inequality.2 + x ? 10, x = 8
A. No B. Yes
Mathematics