Please help and click on this. I've been trying to get this question on brainy for about 3 whole days and nobody bothers to answer. How many ounces of pure vinegar must be added to 80 ounces of a 10% solution to make a 25% solution? please and thank you

50 ! pls ! 12.  building codes regulate the steepness of stairs. homes must have steps that are at least 13 inches wide for each 8 inches that they rise.

a. discuss how to find the slope of the stairs.
b. describe how changing the width or height affects the steepness of the stairs.

Which of the following is true for the relation f(x)=2x^2+1

Which ordered pair is a solution to the system of linear equations? 2x + 3y= 6 –3x + 5y = 10