QRST is a rectangle. Find the length of the diagonals.

QS=8x−11 and RT=4x+21

For the rule of 78, for a 12-month period, the last term in the sequence is 12 and the series sums to 78. for an 10 month period, the last term is and the series sum is . for a 15 month period, the last term is and the series sum is . for a 20 month period, the last term is and the series sum is

Terri makes a quilt using three sizes of fabric squares the side lenght of each fabric square is the square root of the area

Is the figure congruent? yes or no?