Question 189525
a general form would be ___ y = m * n^x


for the first point ___ -5 = m * n^0 ___ -5 = m * 1 ___ -5 = m


for the second point ___ -20 = -5 * n^-2 ___ 4 = n^-2 ___ 1/4 = n^2 ___ 1/2 = n


so the function is ___ y = -5 * (1/2)^x


since the base for the exponent is fractional (<1), the function represents exponential decay