Solve the equation by completing the square.5x2 - 2x - 1 = 0
A. 
B. 
C. 
D. 
Answer: B
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Solve the problem.A tank initially contains 140 gal of brine in which 40 lb of salt are dissolved. A brine containing 1 lb/gal of salt runs into the tank at the rate of 6 gal/min. The mixture is kept uniform by stirring and flows out of the tank at the rate of 10 gal/min. Write, in standard form, the differential equation that models the mixing process.
A. 
= 6 - 
y
B. 
+ 
y = 10
C. 
+ 
y = 6
D. 
+ 
y = 6
Suppose you have the project consisting of the six tasks described in the following table.
Which project digraph below models the project described?
A. 
B. 
C. 
D. 
E. none of these
Find the perimeter of the figure.Square
A. 19 cm B. 38 cm C. 180.5 cm D. 48 cm
Graph the solution of the quadratic inequalities on a number line and write the solution in interval notation. x2 - 5x ? -6
A. [3, ?)
B. (-?, 2]
C. [2, 3]
D. (-?, 2] ? [3, ?)