In which step did leticia make her first mistake

Me ! write an equation for the interior angles of this triangle that uses the triangle sum theorem

Given a(-12,5) and b(12,29) find the point that divides the line segment ab three-eighths of the way from a to b

At his new job, jeremiah can choose an hourly rate of $9 plus a $50 weekly bonus for opening the store, or an hourly rate of $10 per hour with no opening bonus. the equations model his salary options. y = 9x + 50 y = 10x