Help. Thanks much. :(

I mam, i already answered the 3. i think it goes to the formula of phytagoreas. thanks much. one last question mam? :)

I am not at all sure what you mean Kathh22 :(

1. x=3, y=4

I don't think this is what you want but.....

ok well you just want the distance of the point from the origin.

I already did the first one.

Draw a sketch on a number plane to get the idea.

2. y=-5, r=13

This is saying that the hypotenuse is 13 and the y direction is -5 units

so

\(x^2=13^2-(-5)^2\qquad \mbox{ it is minus cause you are finding the short side of a right angled triangle}\\ x^2=169-25\\ x^2=144\\ x=+12\quad or \quad x=-12 \)

3.  x=3, r=5

\(x^2=25-9\\ x^2=16\\ x=\pm4\)

Think about it and if you still do not understand then let me know :))

Yes it is just the Pythagorean theorem :))