What’s the approximate perimeter of △ABC?

Which order pair could be removed so that the set of order pairs is a function

Which matrix can be multiplied to the left of a vector matrix to get a new vector matrix ?

Line cd passes through points c(1, 3) and d(4, –3). if the equation of the line is written in slope-intercept form, y = mx + b, what is the value of b? –5 –2 1 5