A1150 kg car is on a 8.70° hill. using x-y axis tilted down the plane, what is the x-component of the weight?

I assume the x-y axis are tilted such that the x-axis is parallel to the surface of the hill while the y-axis is perpendicular to it.

In this case, the x-component of the weight is given by:

where
m is the mass of the car
g is the acceleration of gravity
is the angle of the hill

Substituting numbers into the formula, we find