The attached photo is the distance formula and I will try to explain how to do the first problem the best I can.
First, your points will be (-5,0) and (-4,5). Those are (x,y).
You plug -4 into the first x place and -5 into the second x place in the formula. You plug 5 into the first y place and the 0 into the second y place.
After doing the math within the radical you should end up with either 1^2 + 5^2 or 1 + 25.
I would put it into a calculator and you should end up with 5.1 as your answer (rounded)
Let me know if you need anymore help!