The derivative of e to the ax is equal to a e to the ax, just from the chain rule, derivative of the inside is just a, and then we multiply that times the derivative of the entire thing, and derivative of e to the x is just e to the x. Or we could say that the integral of e to the ax dx is equal to one over a e to the ax plus c. And you could take the derivative of this to see that you would get this right over here. So using that same idea, the antiderivative of this over here is just going to be the negative 13.84, and we're going to divide by this coefficient on the t right over here. So negative 0.173, and you could use your calculator. Calculators are allowed for this part of the problem, but we could do this analytically. Times e to the negative 0.173 times t, and we're going to evaluate that. We're going to evaluate that from zero to 10.