Perform the indicated operation. (-10) ÷ (-20)

a.1/2
b.-1/2
c.2
d.-2

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?

5/6+7/8what is the answer sealsdbdbshd

Rounded to the nearest tenth, what is the value of x