Solve the problem.Suppose that the revenue from selling x radios is r(x) = 70x - 
dollars. Use the function r '(x) to estimate the increase in revenue that will result from increasing production from 125 radios to 126 radios per week.
A. $45.00
B. $95.00
C. $57.50
D. $44.80
Answer: A
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Provide an appropriate response.In how many ways may 4 digits be arranged to form a 2-digit number without repeating digits?
A. 12 B. 16 C. 8 D. 4
Use the graph to complete the identity.
= ? 
A. cot 3x + cot 7x B. -tan 2x C. 2 tan 5x tan 2x D. tan 5x
Forces F1 and F2 act at the same point. Find the resultant force F and its magnitude.F1 = 0.1i + 0.4j, F2 = -1.3i - 9.2j
A. F = 0.5i - 10.5j ; 
= 10.511898
B. F = -1.2i - 8.8j ; 
= 8.88144132
C. F = -1.2i + 9.6j ; 
= 9.6747093
D. F = -1.2i - 9.6j ; 
= 9.6747093
Solve the problem.A straight trail with a uniform inclination of 17° leads from a lodge at an elevation of 600 feet to a mountain lake at an elevation of 7500 feet. What is the length of the trail (to the nearest foot)?
A. 7843 ft B. 23,600 ft C. 7215 ft D. 25,652 ft