Round 8,503 to nearest thousand

Achemist has 200 ml of a 10% sucrose solution. she adds x ml of a 40% sucrose solution. the percent concentration, y, of the final mixture is given by the rational function: the chemist needs the concentration of the final mixture to be 30%. how many milliliters of the 40% solution should she add to the 10% solution to get this concentration?

If p(a) = 0.70 and p(b) = 0.20, then a and b are independent events if

X-10/4 when x = –18 a 7 b –2 c –7 d 2