Directions: Work in a group of 5 members. Solve the puzzle and do the activity.
Problem: Think of a number less than 20. Subtract this
number from 20 and multiply the difference by twice the
original number. What is the number that will give the largest
product?
The first group who gives the largest product wins the game.”
a. Record your answer on the table below:
b. Draw the graph.
c. Find the vertex and compare it to your answer in the puzzle.
d. If n is the number you are thinking, then how can you express the other number,
which is the difference of 20 and the

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