Add. 6x -5x +3
+
3x2 + 7 x-8

A. 9x2 - 2x + 5
B. 9x2 + 2x-5
C. 9x2 + 12x-5
D. 9x2 + 2x + 11

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?

Can someone me with this problem . show your work .

Ageologist had two rocks on a scale that weighed 4.6 kilograms together.rock a was 0.5 of the total weight.how much did rock a weigh?