If a= (0,0) and b = (2,5) what is the appropriate length of ab

Identify an equation in point slope form for the line perpendicular to y=3x+5 that passes through (4,-1)

You dug a hole that was 8 feet deep. after taking a short break, you dug down 3 more feet in the same hole. when finished digging, a tractor accidentally filled the hole with 4 feet of dirt. how deep is your hole now?

Determine the area of a triangle with (see picture below)