What is this equation? What does the 1 stand for. Is the amount for the server supposed to be the total or the tip. No context from other questions. Please help!

This an optional brain teaser my math teacher does and most of them I've figured out but this one is stumping me

How do I solve this? Like, what steps do I take? The decimal points are confusing me a bit.

I didn't know you could square an entire equation but I don't know how to get the root away from the equation. If I square everything I get x+6=x which isn't true. How do I solve this?

I am so stuck, i've tried my best, and havent been able to get into my teacher to ask, help will be appreciated

My answer is apparently wrong even though it is unfinished but the standard form I have found is apparently incorrect can someone spot where I may have gone wrong?

Please help I don't even know where to start... is there a formula 5o figure this out or? (My teacher never went through this and I have a math test tmr, these are study questions)

Is this right? Or should these all add up to 30 as per the question? Thanks

Not drawn to scale ofc, sorry

Help

I have tried solving this but i have no idea how to continue from this step. The only real answer is x1= 0. Does anyone have any idea how to solve this without guessing the answer?

question 5