Which strategy do you prefer to use to multiply with multiples of 10: base ten blocks, a number line, or place value?

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?

If c(x) = 4x – 2 and d(x) = x2 + 5x, what is (cxd)(x)

Long division the problem is 40 ➗ 348 = ?