Solve the problem.Roberto invested some money at 8%, and then invested $3000 more than twice this amount at 11%. His total annual income from the interest was $3930. How much was invested at 11%?
A. $27,000
B. $9000
C. $24,000
D. $2700
Answer: A
Mathematics
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Find the indicated probability.The following table relates the grades in an advanced mathematics course to the student's year in college:
Let E be the event that the student received a grade of B. Let F be the event that the student is a sophomore. Find P(F?E).
A. 
B. 
C. 
D. 
Mathematics
Provide an appropriate response.Simplify and express your answer in terms of positive exponents; rationalize the denominator to avoid fractional exponents in the denominator: 
What will be an ideal response?
Mathematics
Graph the curve.r = 2 + 2 sin ? (cardioid)
A. 
B. 
C. 
D. 
Mathematics
Solve the formula for the indicated variable.
+ 
= c for b
A. b = 
B. b = ac - 
C. b = 
D. b = 
- a
Mathematics