How can i find the volume of a rectangular prism when the base is 1 2/3 the width is 2 1/4 and the height is 5/6

What expression is equivalent to 42x-56y

Using only the digits 5, 6, 7, 8, how many different three digit numbers can be formed if no digit is repeated in a number?

Two poles, ab and ed, are fixed to the ground with the of ropes ac and ec, as shown: what is the approximate distance, in feet, between the two poles? 6.93 feet 8.66 feet 12.32 feet 15.59 feet