What is 44.5443495 rounded to the nearest thousand

Step-by-step explanation:

To the nearest thousand the answer is 0.

If you meant thousandth then the second 4 to the right of the decimal point occupies the thousandth place. so that 4 is followed by a 3, that 4 is not changed.

The answer is 44.544

but it does depend on what you meant.

Think of A = [ a1 a2 a3 ].

The text points out that a1 + a3 = a2.

Rewrite this as a1 -a2 + a3 = 0.

As a matrix equation, Ax = 0 for x = (1, -1, 1).