Please help me in this Im failing.

[10 points, algebra 2]according to my answer key the restrictions are -1 and 4. but why not positive 1?

If chord ab is congruent to chord cd, then what must be true about ef and eg?

What is the range of the function? f(x)=-2|x+1|? a. all real numbers. b. all real numbers less than or equal to 0. c. all real numbers less than or equal to 1. d. all real numbers greater than or equal to 1