Ñame the additive inverse and the multiplique inverse for each number 3

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 expression shows the sum of the polynomials with like terms grouped together

Find the center and the radius of the circle with the equation: x^2-2x+y^2+4y+1=0?