Answer:
x = 
Step-by-step explanation:
given
cos(x -
) = - 1, then
x -
=
(- 1) = π
Add
to both sides, hence
x = π +
= 
Answer:
a
Step-by-step explanation:
Given:

To solve, we need to get n isolated on one side. To do this, subtract 10 from both sides. This will cancel the +10 on the right side and give us -12 of the left, leaving us with:
or 
If you want to check your answer, plug in -12 for n.


The statement is true, therefore,
.