For a regular 15-gon:
a. what is the sum of the measures of its interior angles?
b. what is the measure of one interior angle?
c. what is the sum of the measures of its exterior angles?
d. what is the measure of one exterior angle?
e find the sum of your answers to parts b and d. explain why this sum makes sense.

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?

Acircular garden with radius of 8 feet is surrounded by a circular path with a width of 3 feet. what is the approximate area of the path alone? use 3.14 for π

See attachment below and find the equivalent of tan(∠qsr)