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(a) accelerating upward with an acceleration whose magnitude is 2.70 m/s2, and

(b) accelerating downward with an acceleration whose magnitude is 2.70 m/s2.

For both, I started out with Ff=uFn

For (a), I did: Fn + 2.7 = 3.8. Solved for Fn, and of course, my answer was wrong.

For (b), I did: 3.8 + 2.7 = Fn. Again, wrong answer.

I did everything the way my teacher taught me to. I'm incredibly frustrated; I don't understand my mistake(s).