Solve the equation 4n-2n=4?

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 value of x is in the solution set of 4x – 12 s 16 + 8x?

The weight of an object in the water is 7% of its weight out of the water. what is the weight of a 652g object in the water?