Find the sum of 6.28x10^3 and 9.5x10^1 in standard form

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?

What number line represents the solution set for the inequality -1/2 greater than or equal to 4

Which of the following represents a function? 50 !