Find pairs of natural numbers:
1) xy+y=4
2) x²+ y²= 13

If 1 is divided by the sum of y& 4.the result is equal to 3 divided by 4, find the value of m

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 is the y-intercept of the line given by the equation