Given: cos a =-24/25 , sin B =3/5 , a and B are second-quadrant angles; find cos(a -B )
multiple choice:
3/5
4/5
117/125

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?

Find the measurement of angle b in the following triangle

[tex]a + (3a - 2b) - (4a - 3b)[/tex]whats the answer to this ? ?