Solve the problem.Roberto invested some money at 7%, and then invested $2000 more than twice this amount at 9%. His total annual income from the two investments was $3680. How much was invested at 9%?
A. $6000
B. $30,000
C. $3000
D. $28,000
Answer: B
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Evaluate the limit.
Solve.Linda invests $25,000 for one year. Part is invested at 5%, another part at 6%, and the rest at 8%. The total income from all 3 investments is $1600. The income from the 5% and 6% investments is the same as the income from the 8% investment. Find the amount invested at each rate.
A. At 5%: $5000; at 6%: $10,000; at 8%: $10,000 B. At 5%: $8000; at 6%: $10,000; at 8%: $7000 C. At 5%: $10,000; at 6%: $10,000; at 8%: $5000 D. At 5%: $10,000; at 6%: $5000; at 8%: $10,000
Solve the equation.5(z + 2) - (4z - 6) = -7
A. 23 B. 9 C. 15 D. - 23
Solve the equation using a graphing calculator. Round the answer to two decimal places.-4x2 + 4x + 5 = 0
A. {-0.72, 1.72} B. {-11.5, 12.5} C. {-1.45, 3.45} D. {-1.72, 0.72}