Which of the following z-values, standard deviations, and sample sizes produce a margin of error of 0.95?
z = 2.14; s = 4; n = 9
z = 2.14; s = 4; n = 81
z = 2.14; s = 16; n = 9
z = 2.14; s = 16; n = 81

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

Expresa commuter train leaves downtown sation and travels at a average speed of 55 miles per hour towards the north side sation, which is 50miles away. thirty minutes later, express commuter train #7 leaves north side and travels at a average speed of 35miles per hour towards downtown sation. at the moment the two trains pass each other, how far(in miles) is train #12 from the downtown sation and how long(in minutes) has the #12 train been traveling

What is x and y intercepts for y=x+7