Determine the exponential function that satisfies the given conditions: the initial mass is 1.4g and it is halving every 4 days.

Monthly water bills for a city have a mean of $108.43 and a standard deviation of $32.09. find the probability that a randomly selected bill will have an amount greater than $155, which the city believes might indicate that someone is wasting water. would a bill that size be considered unusual?

Lines a and b are perpendicular. if the slope of line a is 3, what is the slope of line b?

The function below is written in vertex form or intercept form. rewrite them in standard form and show your work. y = (x+4)(x+3)