Which expression shows you how you can use mental math to simplify the expression (53 + 23) + 7 most easily? a. 7 + (23 + 53) b. (23 + 53) + 7 c. 53 + (23 + 7) d. 7 + (53 + 23)

The diagonals of a quadrilaretral intersect at (-1,4). one of the sides of the quadrilateral is bounded by (2,7) and (-3,5) determine the coordinates of the other side in order for the quadrilaretral to be a square.

What is the value of x when x + 7 = 21?

What happens to the area as the sliders are adjusted? what do you think the formula for the area of a triangle is divided by 2?