Chapter 1.3, Problem 38E

Suppose an oil spill covers a circular area and the radius, r, increases according to the graph shown below where t represents the number of minutes since the spill was first observed. Radius (feet) 80 70 60 50 40 30 20 10 0 r 0 10 20 30 40 50 60 70 80 90 Time (minutes) (a) How large is the circular area of the spill 30 minutes after it was first observed? Give your answer in terms of π. square feet (b) If the cost to clean the oil spill is proportional to the square of the diameter of the spill, express the cost, C, as a function of the radius of the spill, r. Use a lower case k as the proportionality constant. C(r) = (c) Which of the following expressions could be used to represent the amount of time it took for the radius of the spill to increase from 20 feet to 60 feet? r(60) - r(20) Or¹(80-30) r(80) - r(30) r-1(80) - r−1(30) r-1(60) - r¹(20)

6. Graph the function f(x)=log3x. Label three points on the graph (one should be the intercept) with corresponding ordered pairs and label the asymptote with its equation. Write the domain and range of the function in interval notation. Make your graph big enough to see all important features.

Find the average value gave of the function g on the given interval. gave = g(x) = 8√√x, [8,64] Need Help? Read It Watch It

3. Mary needs to choose between two investments: One pays 5% compounded annually, and the other pays 4.9% compounded monthly. If she plans to invest $22,000 for 3 years, which investment should she choose? How much extra interest will she earn by making the better choice? For all word problems, your solution must be presented in a sentence in the context of the problem.

4 πT14 Sin (X) 3 Sin(2x) e dx 1716 S (sinx + cosx) dx

Let g(x) = f(t) dt, where f is the function whose graph is shown. 3 y f(t) MA t (a) At what values of x do the local maximum and minimum values of g occur? Xmin = Xmin = Xmax = Xmax = (smaller x-value) (larger x-value) (smaller x-value) (larger x-value) (b) Where does g attain its absolute maximum value? x = (c) On what interval is g concave downward? (Enter your answer using interval notation.)

2. Graph the function f(x)=e* −1. Label three points on the graph (one should be the intercept) with corresponding ordered pairs (round to one decimal place) and label the asymptote with its equation. Write the domain and range of the function in interval notation. Make your graph big enough to see all important features. You may show the final graph only.

ansewer both questions in a very detailed manner . thanks!

Question Considering the definition of f(x) below, find lim f(x). Select the correct answer below: -56 -44 ○ -35 ○ The limit does not exist. x+6 -2x² + 3x 2 if x-4 f(x) = -x2 -x-2 if -4x6 -x²+1 if x > 6