7. Two spherical objects have masses of 250 kg and 540 kg. Their centers are separated by a distance of 30 m. Find the gravitational attraction between
them.

Do 12/14 and 8/10 have the same value? explain your answer.

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?

If p(a) = 0.70 and p(b) = 0.20, then a and b are independent events if