Triangle DEF is formed by connecting the midpoints of the sides of triangle ABC. What is the perimeter of triangle ABC?

Can someone answer this question? : )

When the solutions to each of the two equations below are graphed in the xy-coordinate plane, the graphs of the solutions intersect at two places. write the y-cordninates of the points of intersection in the boxes below in order from smallest to largest. y=2x y=x^2-3

Christina can paint 420 square feet in 105 minutes. which unit rate describes the scenario?