Solve for the indicated variable.
= 
+ 
, for A
A. A = 4 + B + C
B. A = 
C. A = 
D. A = 
Answer: D
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Factor by substitution.21( 3 - p)2 - 13( 3 - p) + 2
A. ( 19 - 7p)( 8 - 3p) B. ( 19 - 7p)( 8 + 3p) C. ( 19 + 7p)( 8 + 3p) D. ( 19 + 7p)( 8 - 3p)
Use the substitution method to solve the system. x + 8y = 84x - 3y = -3
A. (1, 1) B. (1, 0) C. (0, 0) D. (0, 1)
Find the vertex, focus, and directrix of the parabola. Graph the equation.(x - 3)2 = (y - 3)
A. vertex: (3, 3)
focus: (3.25, 3)
directrix: x = 2.75
B. vertex: (-3, -3)
focus: (-2.75, -3)
directrix: x = -3.25
C. vertex: (3, 3)
focus: (3, 3.25)
directrix: y = 2.75
D. vertex: (-3, -3)
focus: (-3, -2.75)
directrix: y = -3.25
Solve the problem.The paired data below consist of the temperatures on randomly chosen days and the amount a certain kind of plant grew (in millimeters). Use the equation of the least squares line to predict the growth of a plant if the temperature is 78. 
A. 31.68 mm B. 29.42 mm C. 32.31 mm D. 31.06 mm