Find the LCM and HCF of the following integers by applying the prime factorization method12, 15 and 21. answer plzzz.

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?

Which value of m will create a system of parallel lines with no solution? y = mx - 6 8x - 4y = 12

Which expression demonstrates the use of the commutative property of addition in the first step of simplifying the expression (-1+i)+(21+5i)+0