A student concludes that the solution to the equation ( 2×+1+3=0 is×=4

How can we find the measure of an exterior angle if we know the measurement of an interior angle

Using elimination, what is -4x+2y=-12 4x+8y=-24

The perimeter of an equilateral triangle is 4 cm more than the perimeter of a square and the length of a side of the triangle is 8 cm more than the length of a side of the aware. find the length of a side of the equilateral triangle