Using calculus, the area of the region under y=1/(1+x^2), above the x-axis and between x=a and x=b is tan^(-1)b - tan^(-1)a. Use this result, shown in the figure, to find the area of the region under y=1/(1+x^2), above the x-axis, and between a=-1 and b=1

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?

Kayaks rent for $35 per day. which expression can you use to find the cost in dollars of renting 3 kayaks for a day?

The tile along the edge of a triangular community pool needs to be replaced? ?