Solve the problem.A formula for the focal length of a lens is f = 
. Calculate f (the focal length) for a = 14 cm and b = 19 cm. Round to the nearest tenth of a centimeter, if necessary.
A. 9.5 cm
B. 8.1 cm
C. 5.9 cm
D. 7.0 cm
Answer: B
Mathematics
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Use an appropriate identity to find the exact value of the expression.cos 
A. - 
B. 
C. 
D. 
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A certain tree grows by 2/t + e(-t2/2) feet per year, where t is the time in years. Use Simpson's rule with whole year intervals to estimate the total growth during the stated time interval.From t = 1 to t = 4
A. 4.289 ft B. 5.392 ft C. 3.173 ft D. 5.571 ft
Mathematics
Give the meaning of the metric prefix.hecto
A. 10
B. 
C. 1000
D. 100
Mathematics
Decide whether the expression has been simplified correctly.60x = 0
A. Not simplified correctly B. Simplified correctly
Mathematics