Hello I have a problem. my math teacher is absent and I have a sub who can't help me figure this out. we are learning about matrices and matrix addition, but I have nothing to go on. I require all the information I can get on it such as

What is it
What is it used for
how can I solve it

Any answer (good or bad) is welcome.
-Thank you

What is it?

Two matrices can be added together if and only if they have the same dimension. Their sum is obtained by summing each element of one matrix to the corresponding element of the other matrix.

How is it used?

The numbers in a matrix can represent data, and they can also represent mathematical equations. In many time-sensitive engineering applications, multiplying matrices can give quick but good approximations of much more complicated calculations.

How can I solve it?

Here is a thing https://www.purplemath.com/modules/mtrxadd.htm

Step-by-step explanation:

Look at this video at the Khan Academy:  https://www.khanacademy.org/math/precalculus/x9e81a4f98389efdf:matrices/x9e81a4f98389efdf:adding-and-subtracting-matrices/a/adding-and-subtracting-matrices

Step-by-step explanation:  Matrices are useful in solving multi-variable equations.  They incorporate a process of various matrix manipulations that lead to the solutions that satisfy a series of equations.  An example might involve two equations:

5x+7y=11  

13x+17y=25

A 2X2 matirx can solve these equations.

Review:  https://www.mathsisfun.com/algebra/matrix-introduction.html

step-by-step explanation: step 3 should really go to step seven, but anyway never mind.

1 ∠oln ≅ ∠lno

answer: the answer is (b) amie should have multiplied

step-by-step explanation: given a sphere and a cylinder with same radius and height.

let, 'r' be the radius of the cylinder and sphere and 'h' be the height of the cylinder. according to the question,

r = h.

now, the volume of the sphere will be

and the volume of the cylinder will be

therefore, we have

thus, ammie should have multiplied the volume of the sphere