You need 480 ml of a 50% alcohol solution. on hand, you have a 40% alcohol mixture. how much of the 40% alcohol mixture and pure alcohol will you need to obtain the desired solution?
you will need
ml of the 40% solution
and
ml of pure alcohol

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?

What are the measures of ∠a, ∠b, ∠c and ∠d? explain how to find each of the angle measure.

In two or more complete sentences describe how to determine the appropriate model for the set of data, (1,1), (3,2), (6,3), (11,4).