When a population of controls are selected in such a way that the control group overall characteristics matches that of the cases, it is referred as:

Kendra had twice as much money as kareem. kendra later spent $8 and kareem earned $6. by then,the two had the same amount of money. how much money did each have originally?

Write an equation of the line that passes through 9,2 and is parallel to the line y=5/3x+9

Find the unit rate for: 75% high-fiber chimp food to 25% high -protein chimp food.