Help Please.. 1 /2x + y = 4 What is the x-intercept? What is the y-intercept?

The suare root of 9x plus 7 plus the square rot of 2x equall to 7

Me. i can't figure out this question. give an explanation too. .

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?