I'm running out of time, plz help! Which lines represent the approximate directrices of the ellipse? Round to the nearest tenth. x = −8.6 and x = 8.6 x = −6.6 and x = 10.6 y = −8.6 and y = 8.6 y = −6.6 and y = 10.6

Can someone check my answer? you

Aquantity with an initial value of 3900 decays exponentially at a rate of 35% every hour. what is the value of the quantity after 0.5 days, to the nearest hundredth?

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?