Solve the problem.A formula for the focal length of a lens isf = 
Calculate f (the focal length) for a = 13 cm and b = 11 cm. Round your answer to the nearest tenth, if necessary.
A. 6.5 cm
B. 5.5 cm
C. 6.0 cm
D. 7.0 cm
Answer: C
Mathematics
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Divide the polynomial by the monomial.
A. 2x8 + 21x6 B. 9x14 C. 6x10 + 7x4 D. 2x8 + 7x4
Mathematics
Use the graph of a known basic function and a vertical stretch or a vertical compression to sketch the function.h(x) = 
x3
A. 
B. 
C. 
D. 
Mathematics
Solve.A movie ticket service sells tickets over the phone at 25% off the full price plus a $$0.75 per ticket service charge. What is the total cost of 2 tickets that sell for $9 at full price?
A. $13.50 B. $15.00 C. $24.00 D. $12.00
Mathematics
Find an equation of variation for the given situation.y varies directly as x and inversely as z, and y = 14 when x = 2 and z = 8.
A. y = 
B. y = 59xz
C. y = 
D. y = 
Mathematics