How can you tell before dividing that the first digit of the quotient 2,874 divided by 3 is in the hundreds place?

Aperpendicular bisector, cd is drawn through point con ab if the coordinates of point a are (-3, 2) and the coordinates of point b are (7,6), the x-intercept of cd is point lies on cd.

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

What is the approximate difference in tenths between √12 and √15?