Question

Help me with these questions

Answer 1

1 is unclear, please take a better picture

2. x-18=-5, add 18 to both sides so x=13

3. square both sides and get x-8=-x+2, add x to both sides, get 2x-8=2, add 8 to both sides, get 2x=10, divide both sides by 10 and get x=5

4. use distance formula

√( (x-x`)^2 + (y-y`)^2 ) = d

√( (4+5)^2 + (x-8)^2 ) = √155

√ ( 81+x^(2)-16x+64 ) = √155

[I'm not sure how to go from here]