Subtract.15a4 + 12a2
A. 6a6
B. 33a4 + 15a2
C. -3a4 + 9a2
D. -3a4 + 15a2
Answer: C
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Find A-1, if it exists.A = 
A. 
B. 
C. 
D. Does not exist
Find z1z2. Write your answer in standard polar form with the argument in radians.z1 = 2(cos 39° + i sin 39°), z2 = 5(cos 6° + i sin 6°)
A. 7(cos 234° + i sin 234°) B. 7(cos 45° + i sin 45°) C. 10(cos 33° + i sin 33°) D. 10(cos 45° + i sin 45°)
Find the least common denominator for the expression.
- 
A. 18x3y5 B. 18x2y5 C. 18xy D. 18x3y3
Solve the problem.30 marbles are to be divided into three bags so that the second bag has three times as many marbles as the first bag and the third bag has twice as many as the first bag. If x is the number of marbles in the first bag, find the number of marbles in each bag.
A. 1st bag = 6 marbles; 2nd bag = 18 marbles; 3rd bag = 12 marbles B. 1st bag = 5 marbles; 2nd bag = 15 marbles; 3rd bag = 10 marbles C. 1st bag = 6 marbles; 2nd bag = 14 marbles; 3rd bag = 10 marbles D. 1st bag = 5 marbles; 2nd bag = 10 marbles; 3rd bag = 15 marbles