Simplify the expression.(-243)1/5
A. -27
B. 81
C. 3
D. -3
Answer: D
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Solve the problem.The gravitational force (in lb) of attraction between two objects is given by 
where x is the distance between the objects. If the objects are 10 ft apart, find the work required to separate them until they are 50 ft apart. Express the result in terms of k.
A. 
k
B. 
k
C. 
k
D. 
k
Subtract the fractions. Write the answer in lowest terms.
A. 
B. 
C. 
D. 
Add or subtract.(
- 
) + (3
+ 
)
A. 6
+ 13i
B. 6
+ 3
C. 6
- 3i
D. 6
+ 3i
Solve. Round to the nearest ten-thousandth when necessary.An equation used in the study of Class C amplifiers is R = 
,where R is the internal resistance of the tube and ? is the angle that indicates the portion of the cycle during which the current is allowed to flow. Find the value of R when ? is 57°.
A. 0.3464 B. 5.839 C. 0.2714 D. 0.0556