Solve the problem.Roberto invested some money at 6%, and then invested $3000 more than twice this amount at 10%. His total annual income from the two investments was $3160. How much was invested at 10%?
A. $9000
B. $2500
C. $22,000
D. $25,000
Answer: D
Mathematics
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Perform the indicated operation. Simplify the answer when possible.
? 
A. 
B. 
C. 15
D. 
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Solve the problem. Round to the nearest tenth of a percent.Find the annual percentage yield APY corresponding to the given rate of 6.8% compounding quarterly.
A. 7.1% B. 6.9% C. 7.2% D. 7%
Mathematics
Simplify the expression. Assume all variables represent positive real numbers.
A. 6
B. 29
C. 4
D. 9
Mathematics
Write the equation of a sine function that has the given characteristics.Amplitude: 4Period: 5?Phase Shift: 
A. y = 4 sin
B. y = 4 sin
C. y = 4 sin
D. y = 4 sin
Mathematics