Marsha buys x pens at $0.70 per pen and one pencil for $0.10. Which function gives the total amount Marsha spends? A C(x) = (0.70+ 0.10)x B C(x) = 0.70x + 0.10 C(x) = 0.70x + 10 C(x) = 0.70x + 0.10x​