What is the sum of the first eight terms of a geometric series whose first term is 3 and whose common ratio is 1/2 ?

6.3x+14 and 1.5x-6 answer in simplified form

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?

If x-1 and x+3 are the factors of x3+10x2+ax+b find a and b