How much 10% stock solution in ml is used to make a liter of 4% iodine solution?

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?

Ab and bc are tangent to circle d. find x is ab = 3x + 8 and bc = 26. find x

Present age of man is 45 years, 5 years back his age was 4 times age of his son what is present age of his son?