Xavier is x years old and yvonne is y years old. yvonne is 7 years older than xavier. four times yvonne’s age is equal to 200. (a) write an equation that could be used to solve for yvonne’s age, y. (b) how old is yvonne? show your work and don’t forget the unit. (c) how old is xavier? show your work and don’t forget the unit

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?

Suppose you are an avid reader and are looking to save money on the cost of books instead of paying about $20 for each book, you decide to look into purchasing a kindle for $120 you can purchase e-books for about $5 each 1. find the slope-intercept equation for the cost of the hard copy of books using x to represent the number of books 2. find the slope-intercept equation for the cost of the kindle with cost of e-books using x to represent the number of books

Aquadrilateral has exactly one pair of parallel sides. which name best describes the figure?