How do I do number 4

its 6.40

Step-by-step explanation:

you have to use the distance formula which is

so points C is (-5,-1) and D is (0,3)

then you substitute the x

0--5=5^2

then

3--1+4^2=16

25+16=41

then square rout that and it equals 6.40

(3x-8) or (3x+8)

step-by-step explanation:

irrational, cannot