A region in the ry-plane is bounded by the curves y = = cos x and y = n²/4-1² for -T/2 ≤x≤T/2. These curves meet only at x = ±π/2. Sketch a diagram showing the region. Indicate a thin vertical strip within the region, and mark the values of y at its endpoints. (a) (b) Use an area integral to find the area of the region.

Express the rate of inflation from 1985 to 2015 as a percent correct to two decimal places. (see graph)

An environmental engineer wants to evaluate three different methods for disposing of nonhazardous chemical waste: land application, fluidized-bed incineration, and private disposal contract. Use the estimates below to help her determine which has the least cost at /= 15.00% per year on the basis of an annual worth evaluation. First Cost AOC per Year Salvage Value Life Land $-145000 $-86000 $23000 4 years Incineration $-760000 $-70000 $260000 6 years Contract O $-132000 O 2 years