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@ParthKohli can you help?

No, I am not well-versed in vectors :-(

Here it is: (try to get the lengths of a_x and a_y, the x and y components of a.

oh sorry, wrong considering , give me a moment

I used Geogebra. Look it up at geogebra.org (it's free).

ok , my bad ,i got 7

Here's another drawing.
The sum of the x-components is -5 + -2.5 = -7.5.
The only y-component is 2.5√3. (there is a 30-60-90-triangle involved).
So to compensate, c should go 5.5 to the right and 2.5√3 down:
(lenght is indeed 7!)

You're welcome!