Answer:
See Explanation
Step-by-step explanation:
(a)For matrices A and D, given that: 
.
We want to show that 
, Ax=b has a solution.
If Ax=b
Multiply both sides by D
This means that the system Ax=b has a solution.
(b)Matrix A has a pivot position in each row where each pivot is a different column. Therefore, A must have at least as many columns as rows.
This means A cannot have more rows than columns.
Perimeter:
add all sides
(1/2)+(1/2)+(1/2)+(1/2)+1+1 = 1+1+1+1 =4cm
From these three undefined terms, all other terms in Geometry can be defined. In Geometry, we define a point as a location and no size. A line is defined as something that extends infinitely in either direction but has no width and is one dimensional while a plane extends infinitely in two dimensions.
Hope this helps you !!
The calculation for circumference is 2πr or 2 × π (pi=3.14) × radius of a circle
Since the diameter of this circle is 7cm, and the radius is half of the diameter, 7 ÷ 2 = 3.5
So, 2×3.14(π)×3.5=21.98
