The manufacturer of GRIPPER tires modeled its return to sales from television advertising expenditures in two regions, as follows:
Region1: 
Region2: 
where 
and 
are the sales revenue in millions of dollars, and 
and 
are millions of dollars of expenditures for television advertising. How much money will be needed to maximize sales revenue in both districts? Round your answer to the nearest million dollars.
A. $14 million
B. $39 million
C. $25 million
D. $18 million
E. $19 million
Answer: B
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Find a rectangular equation for the plane curve defined by the parametric equations.x = 5 tan t, y = 4 cot t
A. y = 
B. y = 
sin x
C. y = 
cos x
D. y = 
Solve the problem.A police helicopter is monitoring the speed of two cars on a straight road. The helicopter is at an altitude of 
feet directly above the road. At one instant, the angle of elevation from the first car to the helicopter is 
and the angle of elevation from the second car to the helicopter is 
How far apart are the two cars to the nearest foot? Assume that both cars are in front of the helicopter.
A. 107 ft B. 2796 ft C. 328 ft D. 2645 ft
Mark as true any statement that is always true. Mark as false any statement that is never true or that is not necessarily true. Be able to justify your answers.
1. The sentence “a:b = c:d” is a ratio.
2. 
3. The mean proportional of m and n is
4. If three angles of one triangle are congruent to three angles of a second triangle, then the
triangles are similar.
5. If two triangles are similar, then they are congruent.
Perform the indicated operations. Round the result to the nearest thousandth if necessary.Nick is going to put insecticide on his lawn to control grubworms. The lawn is a rectangle that measures 236.7 feet by 89 feet. The amount of insecticide required is 0.02 ounces per square foot. a) Find the area of the lawn.b) Find how much insecticide Nick needs to purchase.
A. a) 21,066.3 sq ft b) 1,053,315 oz B. a) 651.4 sq ft b) 13.028 oz C. a) 651.4 sq ft b) 32,570 oz D. a) 21,066.3 sq ft b) 421.326 oz