Solve the problem.Roberto invested some money at 7%, and then invested $3000 more than twice this amount at 9%. His total annual income from the two investments was $3270. How much was invested at 9%?
A. $27,000
B. $2700
C. $24,000
D. $9000
Answer: A
Mathematics
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Use the given transformation to evaluate the integral. src="https://sciemce.com/media/4/ppg__10612191744__f1q47g7.jpg" alt="" style="vertical-align: -4.0px;" />
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= 3 + 
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