What fraction of the female children will have hemophilia

What is the result of adding the system of equations? 2x+y=4 3x-y=6

What rule describes a dilation with a scale factor of 4 and the center of dilation at the origin?

Monthly water bills for a city have a mean of $108.43 and a standard deviation of $36.98. find the probability that a randomly selected bill will have an amount greater than $173, which the city believes might indicate that someone is wasting water. would a bill that size be considered unusual?