C) 8 is the appropriate choice
4 dozen are made from 3 cups of flour, so twice that flour (6 cups) will produce twice the number of cookies, 8 dozen.
4n - 9 + 3n + 5 + n = 68
combine like terms
8n - 4 = 68
addition property of equations
8n = 72
division property of equality
n = 9
SIDES:
n = 9
3n + 5 = 32
[ 3(9) + 5 = 32 ]
4n - 9 = 27
[ 4(9) - 9 = 27 ]
36
Add all the sides up
15+15=30
3+3=6
30+6=36
Answer:
Vertex: (4,9)
X int: (1,0),(7,0) = x=-1, x=-7
y iny: (0,-7)