Operation Manual

Chapter 17: Activities 322
10. Press r. After the graph is plotted, press 100 Í to trace to X=100. Press 150 Í. Press 188
Í. Notice that as
X increases, the value of Y converges to p6
2
, which is approximately 113.097.
Y2=pB
2
(the area of the circle) is a horizontal asymptote to Y1. The area of an N-sided regular
polygon, with r as the distance from the center to a vertex, approaches the area of a circle with
radius r (pr
2
) as N gets large.
Computing and Graphing Mortgage Payments
Problem
You are a loan officer at a mortgage company, and you recently closed on a 30-year home mortgage at
8 percent interest with monthly payments of 800. The new home owners want to know how much will
be applied to the interest and how much will be applied to the principal when they make the 240th
payment 20 years from now.
Procedure
1. Select the default mode settings y L7 2 2.Press z and set the fixed-decimal mode to 2
decimal places.
2. Press Œ Í Í to display the TVM Solver. Enter these values.