Solve.The equation that represents the proper traffic control and emergency vehicle response availability in a small city is 
where P is the number of police cars on active duty and F is the number of fire trucks that have left the firehouse in response to a call. In order to comply with staffing limitations, the equation 
is appropriate. The number of police cars on active duty and the number of fire trucks that have left the firehouse in response to a call cannot be negative, so 
style="vertical-align: -4.0px;" /> and 
Graph the regions satisfying all the availability and staffing requirements, using the horizontal axis for P and the vertical axis for F. If 5 police cars are on active duty and 5 fire trucks have left the firehouse in response to a call, are all of the requirements satisfied?
A. No
B. Yes
C. No
D. Yes
Answer: A
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Solve the problem.A sample of 200 grams of radioactive substance decays according to the function 
where t is the time in years. How much of the substance will be left in the sample after 40 years? Round your answer to the nearest whole gram.
A. 0 grams B. 1 gram C. 2465 grams D. 58 grams
Graph the inequality.x + 5y ? -5
A. 
B. 
C. 
D. 
Solve the problem.A railroad tunnel is shaped like a semi-ellipse. The height of the tunnel at the center is 20 ft and the vertical clearance must be 10 ft at a point 15 ft from the center. Find an equation for the ellipse. 
A. 
+ 
= 1
B. 
+ 
= 1
C. 
+ 
= 1
D. 
+ 
= 1
Use a calculator to find the approximate value of the expression. Round the answer to two decimal places.cos 9
A. -0.91 B. -0.99 C. 0.91 D. 0.99