A 2,345kg car is travelling down a highway entrance ramp, at an angle of 5.74 degree at 65 miles/hours and slams on its brakes to keep from hitting another car. If the coefficient of friction between the tires and the roads is 0.403, what is the distance required to stop?

According to one of my friend, he found the Applied Force and Normal Force, and then Friction Force. Afterward he did Net Force and he is just stuck.

I'm not completely sure how to do this problem or even know what friction formula to use for it to be correct.

Help. Thanks.