Well, first we have 4 quarters, or $1. Then, since 2 nickels= 1 dime, we also have 6 dimes and 1 nickel. Simplified, he now have $1.65.
B.the centerpoint formed by low pressure
I would think that the layer of sandstone would be B. Younger than 300 million years because it's above the layer of limestone.
Different colors are easier to be spotted on different countries