Simplify the expression using the order of operations.4[-8 + 2(-5 + 2)]
A. 68
B. -38
C. -56
D. 72
Answer: C
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Determine whether the graph of the equation is a circle or an ellipse.9x2 + 90x + 25y2 - 50y + 25 = 0
A. Ellipse B. Circle
Find the common ratio r for the given infinite geometric sequence.
, 
, 
, 
, 
, . . .
A. 4
B. 12
C. 10
D. 
Answer the question.True or False? The x-coordinate is positive in quadrants I and IV.
A. True B. False
Solve the problem.Use the formula D = 10.0 log (S/S0), where the loudness of a sound in decibels is determined by S, the number of watt/m2 produced by the soundwave, and S0 = 1.00 × 10-12 watt/m2. What is the intensity in watt/m2 of a noise measured at 51 decibels? (Round to an appropriate number of significant digits.)
A. 1.6 × 1014 watt/m2 B. 1.3 × 10-6 watt/m2 C. 1.3 × 10-7 watt/m2 D. 5.1 × 10-10 watt/m2