Solve the problem. Round your answer, as needed.A formula for the focal length of a lens isf = 
Calculate f (the focal length) for a = 8 cm and b = 13 cm.
A. 3.0 cm
B. 5.0 cm
C. 4.0 cm
D. 6.5 cm
Answer: B
Mathematics
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Simplify the radical expression by factoring out the largest perfect nth power. 
A. 3
B. 4
C. 18
D. 4
Mathematics
Find the product.(n - 2)(n - 2)(n + 2)(n + 2)
A. n4 + 8n - 16 B. n4 - 8n2 + 16 C. n4 - 8n + 16 D. n4 + 8n2 - 16
Mathematics
Find the slope of the line containing the given points.f(-5.7) = 5.9 and f(-12.6) = -17.2
A. 
B. - 
C. - 
D. 
Mathematics
Solve the problem.The temperature on a December morning is -9°F at 6 a.m. If the temperature drops 3°F by 7 a.m., rises 9°F by 8 a.m., and then drops 2°F by 9 a.m., find the temperature at 9 a.m.
A. 5°F B. -23°F C. 23°F D. -5°F
Mathematics