Find a formula for a function that has vertical asymptotes x = 4 and x = 6 and horizontal asymptote y = 4.f(x) =

Sure, a function that has vertical asymptotes at x = 4 and x = 6 and a horizontal asymptote at y = 4 can be represented by a rational function. The vertical asymptotes suggest that the denominator of the function will be zero at x = 4 and x = 6. This can be achieved by having factors of (x-4) and (x-6) in the denominator. The horizontal asymptote suggests that the degree of the polynomial in the numerator and the denominator are the same, and the leading coefficients ratio is 1/4.

A possible function could be:

f(x) = (4x^2 - 40x + 96) / ((x - 4)(x - 6))

This function has the required asymptotes. The numerator was chosen such that the leading coefficient is 4 times the leading coefficient of the denominator, ensuring the horizontal asymptote at y = 4.