Question

Which expression represents the distance between the points (a, 0) and (0, 5) on a coordinate grid?
StartRoot a squared + 5 EndRoot
StartRoot a squared + 25 EndRoot
StartRoot (a minus 25) squared EndRoot
StartRoot (a minus 5) squared EndRoot

Answer 1

Distance = sqrt[(a-0)^2 + (0-5)^2] = sqrt[a^2 + 25].

So the correct expression is StartRoot a squared + 25 EndRoot (√(a^2 + 25)).