Find the vertex of the graph of the quadratic function. Determine whether the graph opens upward or downward, find any intercepts, and sketch the graph.
f left parenthesis x right parenthesisf(x)equals=x squared plus 8 x plus 7

12 pack of pens for $1.09

m packs =  1.09*m = 1.09m

1 composition book = $2.79

n composition books = 2.79*n = 2.79n

Total cost = (1.09m + 2.79n)

Since there is a discount of 5%, the net price would be: 100% - 5% = 95%

Net Cost = 0.95*(1.09m + 2.79n)

Cindy's bill =    $ 0.95*(1.09m + 2.79n)