Astudent writes the difference between 15 and the product of 5 and y to describe the expression 5y - 15. explain the error

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?

When 142 is added to a number the result is 64 more then 3 times the number. option 35 37 39 41

An investment decreases in value by 30% in the first year and decreases by 40% in the second year. what is the percent decrease in percentage in the investment after two years