Solve the investment problem.Roberto invested some money at 6%, and then invested $4000 more than twice this amount at 9%. His total annual income from the two investments was $3480. How much was invested at 9%?
A. $3000
B. $30,000
C. $12,000
D. $26,000
Answer: B
Mathematics
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Provide an appropriate response. If an article is discounted 35%, then the cost of the item is what percent of the original cost? Explain.
What will be an ideal response?
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Specify the domain of the function.f(x) = 
A. x ? 4, x ? -4 B. x > 16 C. x ? 16 D. All real numbers
Mathematics
Find the exact perimeter. Then approximate your answer to the nearest tenth.
A. 13
+ 4
, 29.7
B. 9
, 50.9
C. 42, 42.0
D. 21
, 29.7
Mathematics
Solve the problem by estimating.Don travelled for 4 weeks in South America last year and spent $1807 while he was there. Estimate the average amount he spent each day. Round the number of days to the to the nearest ten and the amount of money spent to the nearest hundred.
A. $600 B. $50 C. $500 D. $60
Mathematics