Sorry for asking a lot but could you all help me with 15-23? It would mean a lot. I stayed up till 4:00 am and got no sleep so I can’t focus

Find the value of the variable and the length of each secant segment

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?

In a school 2/3 of the students study a language of those who study a language 2/5 study french