Research was done to study the facial expressions of people, since facial expression clearly shows the emotional state of a person. researchers found that people who smiled a lot lived longer than those who didn't smile much.

which statement can be inferred from the passage?

smiling prolongs human life.

smiling is associated with human longevity.

smiling decreases a person's life span.

there is no link between smiling and human longevity.

Acircle has a circumference of 2 pi cm. which statement about the circumference and area is true? a comparison of the area and circumference is not possible since the area cannot be determined. the numerical values of the circumference and area of the circle are equal. the numerical value of the circumference is greater than the numerical value of the area. the numerical value of the circumference is less than the numerical value of the area.

Which number line correctly shows 0.8 + 0.3?

C. using a standard deck of 52 cards, the probability of selecting a 4 of diamonds or a 4 of hearts is an example of a mutually exclusive event. true of false