Answer: 
<u>Step-by-step explanation:</u>
cos x tan x - cos x = 0
cos x (tan x - 1) = 0
cos x = 0 tan x - 1 = 0
tan x = 1

Answer:
ok so if m is maker and b is poster then
6m+b since she buys 6 markers and 1 poster or
b+6m if she bought it in a different order
Hope This Helps!!!
Undefined
Order of matrix Q is 4 by 3
whereas order of R is 4by 4
In order to add two matrices , they should be of same order.