I don't get it please help me thru it.

10 ! a train starts from grand city and travels toward belleville 388 miles away. at the same time, a train starts from belleville and runs at the rate of 47 miles per hour toward grand city. they pass each other 4 hours later. find the rate of the train from grand city.

The pyramid below was dissected by a horizontal plane which shape describes the pyramid horizontal cross section

Which expression do you get when you eliminate the negative exponents of 4a^2 b^216a^-3 b