Mels purse contains 6 pennies ,8 nickels,4 dimes, and 7 quarters

Which best explains why this triangle is or is not a right triangle?

Add the fractions, and simply the result to lowest terms. 2/3 + 2/7= ?

Luke started a weight-loss program. the first week, he lost x pounds. the second week, he lost pounds less than times the pounds he lost the first week. the third week, he lost 1 pound more than of the pounds he lost the first week. liam started a weight-loss program when luke did. the first week, he lost 1 pound less than times the pounds luke lost the first week. the second week, he lost 4 pounds less than times the pounds luke lost the first week. the third week, he lost pound more than times the pounds luke lost the first week.