Solve.Melissa invested an amount of money in a stock that earned an annual 3% return. She invested three times the original amount in another stock that earned an annual 5% return. If her total yearly return from both investments was $3600, find out how much she invested at 3%?
A. $15,000
B. $20,000
C. $135,000
D. $45,000
Answer: B
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Find the indicated decile or percentile.The weekly salaries (in dollars) of sixteen government workers are listed below. Find the thirty-sixth percentile P36. 
A. 565 B. 539 C. 559 D. 512
Provide an appropriate response.Describe the elements of a 4 × 4 identity matrix.
A. The matrix has zeroes on the main diagonal. All other elements are ones. B. All elements of the matrix are ones. C. The matrix has ones on the main diagonal and zeroes below the main diagonal. D. The matrix has ones on the main diagonal, and all other elements are zero.
Find the sum of the arithmetic series using a formula.1 + 2 + 3 + ... + 421
A. S421 = 88,831 B. S421 = 88,410 C. S421 = 177,241 D. S421 = 177,662
Solve. Write the answer in simplest form.In a typical 54-hour work week, Matthew spends 
of his time in the office. When he is in the office, he spends 
of that time on the phone. How many hours each week does Matthew spend on the phone?
A. 
hours
B. 9 hours
C. 27 hours
D. 18 hours