Solve the problem.Suppose that the revenue from selling x radios is r(x) = 80x - 
dollars. Use the function r '(x) to estimate the increase in revenue that will result from increasing production from 120 radios to 121 radios per week.
A. $55.80
B. $104.00
C. $56.00
D. $68.00
Answer: C
Mathematics
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Use identities to simplify the expression.
- 
A. sec x B. tan2 x sec x C. csc x D. sec x tan x
Mathematics
Fill in the blank with one of the words or phrases listed below.
An angle that measures 90° is called a(n)
angle.
A. straight B. acute C. obtuse D. right
Mathematics
Write the logarithmic equation as an exponential equation.log7
= 
A. 
1/2 = 7
B. 7
= 
C. 
7= 
D. 71/2 = 
Mathematics
Solve the problem.To find the distance AB across a river, a distance BC of 293 m is laid off on one side of the river. It is found that B = 110.8° and 
Find AB. Round to the nearest meter.
A. 90 meters B. 87 meters C. 115 meters D. 118 meters
Mathematics