Explain how you know whether to add or subtract when you use the distributive property to multiply

Rockwell hardness of pins of a certain type is known to have a mean value of 50 and a standard deviation of 1.1. (round your answers to four decimal places.) (a) if the distribution is normal, what is the probability that the sample mean hardness for a random sample of 8 pins is at least 51?

What does the sign of the slope tell you about a line?

Tom travels between the two mile markers shown and then finds his average speed in miles per hour. select the three equations that represent this situation.