Simplify. Write your answers in the form of a+bi, where a and b are real numbers.
A. 
+ 
i
B. 
C. 
- 
i
D. 
i
Answer: A
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Translate the verbal phrase into a mathematical expression. Use x to represent the unknown number.The ratio of a number and 79
A. 
B. 79x
C. 79 - x
D. 79 + x
Solve the problem.One dimension of a rectangular solid is represented by 3x units. The volume of the solid is 
cubic units. Express each of the other two dimensions of the rectangular solid in terms of x.
A. (6x - 4) and (2x - 5) B. (2x + 4) and (6x - 5) C. (2x - 4) and (6x - 5) D. Not enough information is given.
Solve the given differential equation. (The form of yp is given.)25D2y - y = sin x (Let yp = A sin x + B cos x.)
A. y = c1ex/5 + c2e-x/5 - 
sin x
B. y = c1ex/5 + c2e-x/5 - 
cos x
C. y = c1ex/5 + c2e-x/5 + 
sin x
D. y = c1ex/5 + c2e-x/5 - 
sin x + 
cos x
Solve the proportion.
= 
A. x = 
B. x = 30
C. x = 15
D. x = 