The inverse of an equation is only a function if the original function is one-to-one. Meaning it passes the horizontal line test. Our equation is a parabola. While this original is in fact a function, it is not one-to-one. So that means that the inverse will not be a function. Let's find the inverse first, then we will verify its non-function status.
To find the inverse, switch the x and the y and solve for the new y:
and
which means that
Because you are taking the square root of y, you need to allow for both the positive and the negative of the square root of x - 5. Graph these 2 equations in your calculator and you will see that if we do not first restrict the domain of the original equation, our inverse will not be a function.
It will take 15 seconds. You would multiply 50 by 7 and get 350. Then multiply 7 by 2 getting 14 seconds. Split the 2 seconds making it one second and you'll get 375 miles