A.11 - The student will collect and analyze data, determine the equation of the curve of best fit in order to make predictions, and solve real-world problems, using mathematical models. Mathematical models will include linear and quadratic functions.

Patterns: 7^1=7, 7^2=49, 7^3=343,
and so forth. When multiplied out, 7^2 has a units digit of
9, 7^3 has a
units digit of 3, and so forth. What is the units digit of
7^20? Explain your answer by analyzing the pattern.