Carlos bought watermelons for 2.55¢ each and apples for 35¢ each. he bought 8 more apples than watermelons and spent a total of $8.60.

let a represent the number of apples carlos bought and let w represent the number of watermelons he bought.
construct the system of equations that best model the situation.
+=8.60
+=8

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?

Which is the equation of an ellipse with directrices at x = ±4 and foci at (2, 0) and (−2, 0)?

Which of the following is the correct equation for this function? a. y= (x+4)(x+2) b. y=x^2+ 3x – 2 c. y+ 2 = – 2(x+3)^2 d. y+ 2 = 2(x+3)^2