Simplify the expression using the order of operations. Write the answer as an improper fraction where appropriate.- 
+ 
÷ 
? 
A. - 
B. 
C. - 
D. - 
Answer: B
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Use polar coordinates to find the limit of the function as (x, y) approaches (0, 0).f(x, y) = 
A. 1 B. 0 C. 2 D. No limit
Solve the problem.In the study of electrical circuits, the impedance of electron flow in an alternating-current (AC) circuit is expressed as a complex number. The total impedance in an AC circuit connected in series is the sum of the individual impedances. If the impedance in one part of the circuit is 
ohms and in another part is 
ohms, what is the total impedance in the circuit?
A. (-10 - 7i) ohms B. (-10 + 7i) ohms C. -10 ohms D. (-20 + 21i) ohms
Solve the equation by the method of your choice. Simplify irrational solutions, if possible.(7x + 9)2 = 64
A. 
B. 
C. 
D. 
Solve.If an electromagnetic signal moves at the speed of light, about 186,282 miles per second, how long will it take this signal to travel from Miami, Florida to Fairbanks, Alaska, approximately 4100 miles? (Hint: Time = distance ÷ speed.)
A. 0.02 seconds B. 42 seconds C. 0.04 seconds D. 45 seconds