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in Physics we just started acceleration

We were givin 3 equations

v=V(not) + at

x=V(not)t + 1/2at(Squared)

V(Squared) =V(not) + 2ax

Can someone please explain the variables and how to figure them out.

With those equations I need to figure problems like this

The speed limit in a school zone is 44 km/h. A driver traveling at this speed sees a child run onto the road 11 m ahead of his car. He applies the brakes, and the car decelerates at a uniform rate of 10.5 m/s2. If the driver's reaction time is 0.65 s, will the car stop before hitting the child?

YES OR NO

What is the stopping distance of the vehicle in m?

And

A boy throws a stone straight upward with an initial speed of 18 m/s. What maximum height will the stone reach before falling back down

I really don't know where to start. I normally start listing the varables like

V=

a=

t=

x=

But I do not understand what numbers to put in which areas,

Thank you very much