PLEASE HELP IT'S TIMED

Question

asked Feb 4, 2020 157k views

2 Answers

Math Chiller · Answer 1 · 2020-02-07T12:07:02+0000

Answer:

Fourth option

Explanation:

An m×n matrix is a matrix with m rows (horizontal lines) and n columns (vertical lines).

By definition, the multiplication of two matrices
m_1 ×
n_1 and
m_2 ×
n_2 can be done only if:

n_1 = m_2

In the first option:

$n_1 = 2\\m_2 = 1$

In the second option

$n_1 = 1\\m_2 = 2$

In the third option

$n_1 = 2\\m_2 = 1$

In the fourth option

$n_1 = 1\\m_2 = 1$

n_1 = m_2 Multiplication can be done