Matrices consist of columns and rows.
True
O False

True

Step-by-step explanation:

I remembered learning this definition for a matrix:

A Matrix is an arrangement of numbers into rows and columns

so yes matrices consist of rows and columns

b. 24 mm

step-by-step explanation:

use the pythagorean theorem.

a^2 + b^2 = c^2

a^2 + 7^2 = 25^2

a^2 + 49 = 625

a^2 = 576

a = 24

answer: b. 24 mm