# Zak�s Wealthy Uncle by nw2n0Lu

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```									                                                           Standards Addressed: M8A1
M8A4
M8N1
Zak’s Wealthy Uncle

Question:
What are the differences in plans that Zak’s uncle has proposed to donate money to
the school for new computers?

Launch:

   What experiences do you have with fundraisers? How was money raised?
   What is the difference between linear and exponential relationships?
   What is an example of a linear relationship? What is an example of an
exponential relationship?

Investigation:
The differentiated investigation activity is attached below. There are three levels for
this activity – below level, on level, and above level. They are labeled in red, so
make sure to delete this before reproducing for students.

Conclusions:
Have groups write their tables on the board for each plan. Compare the equations of
the graphs. Discuss if the relationships are linear or exponential. Also discuss which
plan will raise the most money for the school. Have the students display their graphs
on the overhead or on chart paper on the board.

In Class Problems:
Write each expression in exponential form:
1. 3 x 3 x 3 x 3
2. 11 x 11 x 11 x 11 x 11 x 11 x 11
3. 1.5 x 1.5 x 1.5 x 1.5 x 1.5

Write each expression in standard form:
1. 210
2. 102
3. 39
M8A4
M8N1
Closure:
On a note-card have students write 3 things they learned today, 2 real life problems
mentioned in class, and 1 thing they are confused about as a ticket out the door. (3-2-
1 strategy)

Homework:
The Relay for Life is suggesting three plans to raise money for a fundraiser. Plan 1
was proposed by a teacher at the school. Plan 2 was proposed by a parent. Plan three
was proposed by a student. Copy and extend the table to show the number of pennies
donated for each miles walked for Relay for Life.

Number of Miles               Number of Pennies Donated
Plan 1              Plan 2                    Plan 3

1                               1                      1                      1
2                               2                      3                      4
3                               4
4

1. How are the patterns of change in the number of pennies donated under plans 2
and 3 similar to and different from the pattern of change for Plan 1?
2. Are the growth patterns for Plans 2 and 3 exponential relationships? If so, what is
the growth factor for each?
3. Write an equation for the relationship between the number of miles walked m and
number of pennies donated p for Plan 2.
4. Make a graph of Plan 3 for p = 1 to 10. How does your graph compare to the
graphs for Plans 1 and 2?
5. For each plan, how many pennies would be raised if the maximum miles to walk
is 16 (per person)?
M8A4
M8N1
Zak’s Wealthy Uncle (Below Level)
Standards
M8A1a. Represent a given situation using algebraic equations.
M8A1i. Interpret solutions in problem contexts.
M8A4c. Graph equations in the form of y = mx + b.
M8A4f. Determine the equation of a line given a graph, numerical information that defines a
line, or a context involving a linear relationship.
M8A4g. Solve problems involving linear relationships.
M8N1i. Simplify expressions containing integer exponents.

Problem:
Zak’s wealthy uncle wants to donate money to Zak’s school for new computers. He suggests
three possible plans for his donations.

Plan 1: He will continue the pattern in this table until day 12.

Day (x)                      1                    2                          3            4
Donation (y)                \$1                   \$2                         \$4           \$8

Plan 2: He will continue this pattern until day 10.

Day (x)                      1                    2                          3           4
Donation (y)                \$1                   \$3                         \$9          \$27

Plan 3: He will continue this pattern until day 10.

Day (x)                    1                      2                          3           4
Donation (y)              \$28                    \$31                        \$34         \$37

a. Complete each table to show how much money the school will receive until the end
of each plan.

Plan 1:
Day (x)          0      1           2     3         4         5       6
Donation (y)           \$1          \$2    \$4        \$8

Plan 2:
Day (x)           0       1          2         3         4        5       6
Donation (y)             \$1         \$3        \$9        \$27
M8A4
M8N1
Plan 3:
Day (x)          0      1       2       3       4
Donation (y)           \$28     \$31     \$34     \$37

b. Graph each plan on the same coordinate plane (use a different color for each plan).
Remember: Independent variable goes on the x-axis and dependent variable goes on
the y-axis

c. Match the equations below to the proper plan:
i. y = 3x-1 goes with Plan ____
ii. y = 3x + 25 goes with Plan ____
iii. y = 2x-1 goes with Plan ____

d. Using your graph, explain what the y-intercept means for each plan. (Why do the
different plans touch the y-axis at different places?)

e. Which plan gives the highest donation at day 4? At day 10? How come the same
plan isn’t always the best for the school? (How come Plan 2 ends up being the best at
day 10 when Plan 3 was best at Day 4?)

f. Zak believes that y = ½ (2x-1) is an equivalent equation to one of the equations in part
c. Is he correct and why? (Substitute values for x into Plan 1 to see if the equations
are the same.)
M8A4
M8N1

Zak’s Wealthy Uncle (On Level)
Standards
M8A1a. Represent a given situation using algebraic equations.
M8A1i. Interpret solutions in problem contexts.
M8A4c. Graph equations in the form of y = mx + b.
M8A4f. Determine the equation of a line given a graph, numerical information that defines a
line, or a context involving a linear relationship.
M8A4g. Solve problems involving linear relationships.
M8N1i. Simplify expressions containing integer exponents.

Problem:
Zak’s wealthy uncle wants to donate money to Zak’s school for new computers. He suggests
three possible plans for his donations.

Plan 1: He will continue the pattern in this table until day 12.

Day                        1                  2                     3             4
Donation                  \$1                 \$2                    \$4            \$8

Plan 2: He will continue this pattern until day 10.

Day                        1                  2                     3             4
Donation                  \$1                 \$3                    \$9            \$27

Plan 3: He will continue this pattern until day 10.

Day                       1                  2                  3                 4
Donation                 \$28                \$31                \$34               \$37

g. Copy and extend each table to show how much money the school will receive until
the end of each plan.
h. Graph each plan on the same coordinate plane (use a different color for each plan).
i. Match the equations below to the proper plan above:
i. y = 3x-1
ii. y = 3x + 25
iii. y = 2x-1
j. Using your graph, explain what the y-intercept means for each plan.
k. Which plan gives the highest donation at day 4? At day 10? How come the same
plan isn’t always the best for the school?
l. Zak believes that y = ½ (2x-1) is an equivalent equation to one of the equations in part
c. Is he correct and why?
M8A4
M8N1

Zak’s Wealthy Uncle (Above Level)
Standards
M8A1a. Represent a given situation using algebraic equations.
M8A1i. Interpret solutions in problem contexts.
M8A4c. Graph equations in the form of y = mx + b.
M8A4f. Determine the equation of a line given a graph, numerical information that defines a
line, or a context involving a linear relationship.
M8A4g. Solve problems involving linear relationships.
M8N1i. Simplify expressions containing integer exponents.

Problem:
Zak’s wealthy uncle wants to donate money to Zak’s school for new computers. He suggests
three possible plans for his donations.

Plan 1: He will continue the pattern in this table until day 12.

Day                        1                  2                     3           4
Donation                  \$1                 \$2                    \$4          \$8

Plan 2: He will continue this pattern until day 10.

Day                        1                  2                     3          4
Donation                  \$1                 \$3                    \$9         \$27

Plan 3: He will continue this pattern until day 10.

Day                       1                  2                  3              4
Donation                 \$28                \$31                \$34            \$37