The math club is selling silk-screened t-shirts as a fundraiser. the t-shirt company charges a one-time set-up fee of $125.00 for the artwork and $0.50 to screen each t-shirt. undecorated shirts cost $5.00 each. which equation models the cost (c) of x number of silk-screened t-shirts?

a)
c equal 125 plus 0.5 x

b)
c equal 125 space minus space 5 x

c)
c equal 125 plus 5.5 x

d)
c equal 125 x plus 5.5