Solve for z:
-21 = 0.072
2 =

Can somebody me out with this question

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 square pyramid has a volume of 441 cubic inches. what is the value of x? 1/7x is the height x is the base