Find measure of 1 this is geometry

Find the distance between the pair of points a(-1,8) and b(-8,4)

If f(x)=-3x+2 and g(x)=-7x-2, which point represents f(x)=g(x)?

The lengths of two sides of a triangle are 9 and 15. what can be said about the length of the third side? a. it must be greater than or equal to 6 and less than 24. b. it must be greater than or equal to 6 and at most 24. c. it must be greater than 6 and less than 24. d. it must be greater than 6 and at most 24.