Exam_3_f2011_KEYpost[1]

# Exam_3_f2011_KEYpost[1] - KEY AAA&BBB(and comments MATH 125...

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1 For the function h ( x ) = (1/3) x a) (3 points) Make a table including AT LEAST 5 specific points that you will want to plot. b) (4 points) On the set of axes to the right, plot the function Make sure that you label the axes. 3.1 16 FOLLOW DIRECTIONS It says plot, plot . It says label axes, label axes . It says include 5 points, make a table that does that. And, since this is an exponential function, use points that play to that. Have the x values include 0, 1 and -1 because you can evaluate those without trouble, and then include 2 & -2 because they are easy as well. YOU DON’T HAVE TO USE YOUR CALCULATOR FOR THIS (OR FOR MANY OF THE OTHER PROBLEMS – USE YOUR MIND INSTEAD). x | -2 | -1 | 0 | 1 | 2 | y = f (x) | 9 | 3 | 1 | 1/3 | 1/9 | Check the properties of exponential functions in the text. Source: 3.1 14 (I was fairly lenient in giving credit for this. Some of you just used positive values for x, and ended up with very small positive fractions that you clearly couldn’t plot. If your tables were ok, I let it pass. But if the direction says “plot,” it strikes me that you should have selected points that you could plot.) 2 What is the formula for the accumulated (total) value, A , of an investment of P dollars compounded n times per year FOR t years at an annual interest rate of r%? (2 points) 3.1 54 modified This subject was covered twice in the text.
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