Eva makes a few dozen cupcakes and sells them for $8 a dozen. Which function represents the relationship between the money Eva earns, m, and the number of dozens of cupcakes she sells, c?
m = f(c) = c × 8
m = f(m) = c × 8
c = f(c) = m × 8
c = f(m) = m × 8
m = f(c) = m × 8