River's chemistry class is doing an experiment in which the students create a 3096 hydrochloric acid mixture by mixing a certain amount of 25% solution with a different amount of 5096
solution. The amount of 25% solution used is 20 liters less than 5 times the amount of 5096
solution used. How much of the 25% solution and the 50% solution are needed in all?
A 30 liters, 10 liters
B 80 liters, 20 liters
C 130 liters, 30 liters
D 50 liters, 40 liters

Suppose there is a simple index of three stocks, stock abc, stock xyz, and stock qrs. stock abc opens on day 1 with 4000 shares at $3.15 per share. stock xyz opens on day 1 with 5000 shares at $4.30 per share. stock qrs opens on day 1 with 6000 shares at $4.60 per share. the price of stock abc on day 8 begins at $3.50. the price of stock xyz on day 8 begins at $3.90. stock qrs opens on day 8 with a price of $4.50 per share. assume that each stock has the same number of shares that it opened with on day 1. what is the rate of change of this simple index over 1 week?

The late fee for library books is $2.00 plus 15¢ each day for a book that is late. if maria’s fee for a late book was $3.20, write and solve a linear equation to find how many days late the book was.

What is the length of the segment, endpoints of which are intersections of parabolas y=x^2− 11/4 x− 7/4 and y=− 7 /8 x^2+x+ 31/8 ?