Which of the following does NOT provide a buffer against the effects of stress?
a. exercise
b. family and friends
c. optimism
d. smoking

The average human heart beats 72 beats per minute. how many times does it beat in 15 seconds?

Use the net as an aid to compute the surface area of the triangular prism. a) 550 m2 b) 614 m2 c) 670 m2 d) 790 m2

Tickets to a science exposition cost $5.75 each for studentd and $7.00 for adults. how many students and adults went if the ticket charge was $42.75