The value of ( 7 + 4root 3) ( 7 - 4 root 3) is​

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?

This is the number of parts out of 100, the numerator of a fraction where the denominator is 100. submit

Twice the sum of a number and 4 is equal to three times the difference of the number and 7. find the number.