Solve the problem.In a parallel electrical circuit, the impedance Z can be calculated using the equation  = where Z1 and Z2 are the impedances for the branches of the circuit. The phase angle measures the phase difference between the voltage and the current in an electrical circuit. If the impedance Z is expressed in the form , ? can be determined by the equation tan 

style="vertical-align: -4.0px;" />. Determine the phase angle ? (in degrees) for a parallel circuit in which  and 



A. 30°

B. 45°

C. 0°

D. 60°

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Answer: B

Mathematics

Solve the problem.David's net pay for a week at the video store was $84.24. If he worked 18 hours that week, what was his net pay rate?

A. $4.96/hour B. $4.68/hour C. $4.50/hour D. $4.75/hour

Apply the distributive property.-3x2(-8x + 5)

A. -24x3 - 15x2 B. 24x3 - 15x2 C. 24x3 + 15x2 D. -24x3 + 15x2

Find the surface area of the figure. Use 3.14 as an approximation for ?. Round your result to the nearest tenth.A stand cut from a right regular cone as shown below. S = ?r  + ?r2 Lateral surface area of entire cone = 188.40 ft2 Lateral surface area of missing cone = 112.34 ft2

A. 162.6 ft2 B. 301.4 ft2 C. 76.1 ft2 D. 239.3 ft2

Use algebraic and/or graphical methods to solve the inequality.m3 - 25m ? 0

A. -5 < x < 0 or x > 5 B. -5 < x ? 0 or x ? 5 C. -5 ? x ? 0 or x ? 5 D. -5 ? x < 0 or x > 5