Which graph represents a quadratic function with a vertex at (0, 0)?

Planning for the possibility that your home might get struck by lighting and catch on fire is part of a plan

Noor brought 21 sheets of stickers. she gave 1/3 of a sheet to each of the 45 students at recess. she wants to give teachers 1 1/2 sheets each.

Find the slope and the y-intercept if there's one and the equation of the line given these two points( 3, 2) and( 3, -4)