Determine the k value if g(x)= 4x+k is a tangent to f(x) =-x²+8x+20​

The amount spent on food and drink by 20 customers is shown below what is the modal amount spent and the median amount spent? 40 25 8 36 18 15 24 27 43 9 12 19 22 34 31 20 26 19 17 28