Turn equation into number (2x+4)

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?

Which is the equation of a line perpendicular to the line with the equation 3x+4y=8

What are the digits that repeat in the smallest sequence of repeating digits in the decimal equivalent of 24/11?