What three things must be true in order for two figures to be similar?

(written response)

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?

If 25% of y is 30, what is 60% of y?

Which equation represents h for right triangle abc