Find the specified vector or scalar.v = 9i + 3j; Find 2v.
A. 11i + 5j
B. 18i + 3j
C. 18i + 6j
D. 11i + 3j
Answer: C
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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) = -2x + 6xy y'(t) = y - 9xy(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 = 0 and y = 
(b) y' = 0 along the lines y = 0 and x = 
(c) (0, 0) and 
B. (a) x' = 0 along the lines x = 0 and y = 3
(b) y' = 0 along the lines y = 0 and x = 9
(c) (0, 0) and 
C. (a) x' = 0 along the lines x = 
and y = 0
(b) y' = 0 along the lines y = 
and x = 0
(c) (0, 0) and 
D. (a) x' = 0 along the lines x = 0 and y = 3
(b) y' = 0 along the lines y = 0 and x = 9
(c) 
and 
Find the area of the figure.
in.
A. 
square inches
B. 
square inches
C. 
square inches
D. 
square inches
Solve.An apartment complex replaced various appliances in the building and billed each tenant a one-time assessment fee for the update. Use the chart below to calculate the cost per apartment unit if there are 29 units.
A. $48.97 B. $979.31 C. $793.10 D. $827.59
Solve the equation.x2 = 44
A. ±2
B. ±4i
C. ±2i
D. ±4