Is the greatest common factor of any two even numbers always even

The value √10 and √15 are plotted on the number line

What is the value of x in the following equation. -x ^3/2 = -27

Ametal rod needs to be 9 feet and 5.5 inches in length. the sections of the poles being used are each 1 foot and 10.5 inches long. how many 1ft 10.5in sections would be needed to complete the 9ft 5.5in metal rod? and how many inches of material will be left?