2 Please help. If CA denotes the circumference of ⨀A and CB denotes the circumference of ⨀B, which equation is true?

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?

Solve the equation using the given values: x= -2.5; y= -7.51. 2xy + 2x²

The price of an item has been reduced by 30%. the original price was $30. what is the price of the item now ?