Suppose the height of a cylinder is equal to its radius. the cylinder can fit inside a square prism, as shown below. The cross-sectional areas are still the same and the ratio of the circle to the area of the square is still pi/4. Complete the derivation of the formula for a cylinder
whose height is equal to its radius.
The prism's volume is the area of the base,
times the height,
Since the ratio of the areas is then the volume of
the cylinder is times the volume of the prism.
V = (4x2), or

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 the equation sqrt(n+5)-sqrt(11-10)=1. what is the value of n

Compute the standard deviation of the following set of data to the nearest whole number. 10, 10, 15, 20, 25