Matrices Review
Advanced Math
Give the dimensions of the following matrices.
-3
8
2) [ 1 -2
-6 7
6) [- 3
4]
7) Kennedy High School Enrollment
9 th Grade
Male
Female
155
186
10 th Grade
11th Grade
202
175
184
179
a) Write a matrix representing the information in the table. Call it matrix A.
12th Grade
193
182
Grade
b) Let Matrix B represent the students absent today.
i) Identify B2
1.
9
10
8 16
B= [
14 12
11 12
12 10
1
18 22
�
ii) What does this entry mean in the 'real world'J ;he, \'\\Ambe.r o .f +ert\O.lt (\
_ ______
L
th
�roh.,S
iii) Find the number of students at school today in each category.
Hint: What operation will you use? Matrix addition?
f\,;L1trix multiplication?
1cn -1\o
\1-S- It.
atrix Subtraction? Multiplying by a scalar?
11-1
I l. I
c) Tomorrow is picture day. If only half of each group of students who are absent today are
absent tomorrow, find the matrix that represents the students who will be absent
tomorrow.
Hint: What operation will you use? Matrix addition? Matrix Subtraction? [Multiplying by a scalar? f
Matrix multi lication?
1-e=
[Y 'i, l,
� '° q
sl
\\J
41,ser,f
-h,
d.ll.Af.
Math Matrices Review Solution Key
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