Greatly Appreciated: Help with Scaling

Hello!

If someone could direct me in how to scale my graph, that'd be fantastic!!

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What I would like is to make the X-Axis Scaling go in increments of 5 instead of the odd 0-2-5-10-30 spacing (know what I mean)?
How would I be able to express that?

Oh and ONE more thing! How do I make the graph so the beginning of the line graph (@zero) touches the y-axis?

All help is appreciated. Thank you very much