What is the value of (-7 + 3) - (2 - 6)?

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?

How many lines can be drawn through points j and k? 0 1 2 3

Consider that lines b and c are parallel. what is the value of x? what is the measure of the smaller angle?