Page 844 - Algebra 1

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Investigation Practice
The first table shows how much money Abram and two friends earned doing chores last summer. The second table shows how much money they made this summer.
Money Earned Last Summer
Money Earned This Summer
a. How can matrices be used to calculate how much more money each person made during the second summer?
b. Use a matrix operation to display the additional money each person made during the second summer. How much more money did Paul make during the second summer than the first?
c. Use scalar multiplication to find the vertices of a quadrilateral whose area is one-fourth of the quadrilateral shown.
Mowing Lawns
Washing Cars
Babysitting
Abram
$15
$55
$0
Paul
$75
$10
$30
Leila
$20
$40
$35
Mowing Lawns
Washing Cars
Babysitting
Abram
$25
$60
$10
Paul
$85
$20
$35
Leila
$30
$60
$40
y
A
4
D
2
O
x
-2
2
4
B
-2
C
-4
Investigation 12 829