Exact values on graphs

[Andiio]

I know that we ALWAYS endeavour to express everything in exact values...
but if it does not explicitly state in the Q to express coordinates in exact values, would we technically lose any marks?

i.e. if you expressed the coordinates of a local max as (-3,3.5), and a y-intercept as (0,2.6)

Also,
Would you lose a mark if you, say, expressed one coordinate as exact: (-3,7/2), yet expressed another coordinate as a decimal? (0,2.6)

Thanks!

[Andiio]

Also, for this question:

Isn't the domain of f^-1(x) = (0,1/2] and not (0,1/2)?