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Help with physics homework

1. Homework Statement
A 2,254-kg car is moving down a road with a slope of 10 degrees while speeding up at a rate of 1.1 m/s^2. What is the direction and magnitude of the frictional force?
(define positive in the forward direction, i.e., down the slope)?


2. Homework Equations
ax=μgcos-gsin


3. The Attempt at a Solution
μ=ax/gcos-gsin 1.1m/9.81(cos10-sin10)=0.138 i keep on getting this answer.
 
191
8
I think it would be useful if you provided more details about your attempt. For starters, what does the free body diagram look like?
 

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