7 1/8 - 3 5/8 plz help me on this math

Let r = 3. what is the value of r + 58?

36 inches/second = yards/minute how many yards?

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?