Y=3x+7
y=-4x+21
wuts the answer plz show work

Mary used 1/7 of a spool of ribbon to complete 4 projects. she used the same amount of ribbon on each project. how much ribbon did she use on each project?

The interior angles formed by the side of a hexagon have measures of them up to 720° what is the measure of angle a

Asquare and an equilateral triangle have the same perimeter. each side the triangle is 4 inches longer than each side of the square. what is the perimeter of the square