Solve the problem.A formula for the focal length of a lens isf = 
Calculate f (the focal length) for a = 7 cm and b = 18 cm. Round your answer to the nearest tenth, if necessary.
A. 3.5 cm
B. 5.0 cm
C. 2.0 cm
D. 9.0 cm
Answer: B
Mathematics
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Solve.The cost, T, in hundreds of dollars, of tuition at one community college is given by the function 
where c is the number of credits for which a student registers. Use a graph to estimate the cost of tuition if a student registers for 10 credits.
A. About $2500 B. About $2100 C. About $1600 D. About $1300
Mathematics
Expand, where i2 = -1.(1 + i)8
A. -64
B. 16
C. 
D. 
Mathematics
Determine whether the statement is true or false.Every whole number is a real number.
A. True B. False
Mathematics
Simplify the expression.
A. 
B. 25
C. 
D. 
Mathematics