Forces: find angle without x/y components?

[Shelilla]

Homework Statement

I just can't seem to find anything that I can relate to for solving this problem and it's giving me a headache.

I don't even know how to start solving this question. Please help:

A man drags a package across the floor with a force of 40 N. The mass of the package is 10 kg. If the acceleration of the package is 3.5 m/s^2 and friction can be neglected, at what angle to the horizontal does the man pull?

Homework Equations

I know that the angle would normally be inversetan(opp/adj) given the x and y components, or for the x/y components it would be hyp. x cos(angle) or hyp. x sin (angle).
I don't have either one though?

The Attempt at a Solution

I drew out a diagram and I cannot find any examples whatsoever in my notes OR online that isn't overly complex with a bunch of coefficients I don't understand, or just the wrong frickin equations every single time I try to look it up.

 

[gneill]

Think about the package accelerating. It's accelerating horizontally across the floor. If you were pulling it horizontally, what size of force would be needed to achieve that acceleration?

 

[Shelilla]

I think I got it, thanks.