Give an appropriate answer.A pharmaceutical company spent $2.4 billion on research last year. Is this more or less than $2.2 billion?
A. More
B. Less
C. not enough information to determine
Answer: A
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Solve the problem.Consider the pair of differential equations that model a predator-prey system with populations x and y. x'(t) = 3x - 4xy y'(t) = -y + 3xy(a) Find the lines along which x'(t) = 0,(b) find the lines along which y'(t) = 0, (c) find the equilibrium points for the system.
A. (a) x' = 0 along the lines x = 
and y = 0
(b) y' = 0 along the lines y = 
and x = 0
(c) (0, 0) and 
B. (a) x' = 0 along the lines x = 0 and y = 
(b) y' = 0 along the lines y = 0 and x = 
(c) (0, 0) and 
C. (a) x' = 0 along the lines x = 0 and y = 
(b) y' = 0 along the lines y = 0 and x = 3
(c) 
and 
D. (a) x' = 0 along the lines x = 0 and y = 
(b) y' = 0 along the lines y = 0 and x = 3
(c) (0, 0) and 
Perform the indicated operation. Simplify if possible.
+ 
A. 
B. 
C. 
D. 
Find the y- and x-intercepts for the equation. Then graph the equation.3x - 12y = 0
A. (0, 0); (0, 0)
B. (0, 0); (0, 0)
C. (0, 0); (0, 0)
D. (0, 0); (0, 0)
Find the measure of the indicated angle.?y
A. m?y = 52° B. m?y = 28° C. m?y = 128° D. m?y = 38°