Answer:
I think z = 89 and I don’t know x
Answer:

Step-by-step explanation:
We need to find the value of
.
C stands for combination.
The formula of combination is as follows :

Here,
n = 19 and r = 1
So,

So, the value of
is 19.
12×12×12×12×12 is equivalent to 12^5 (a^b means a is to be written down B times all being multiplied.)
Answer: A.
They did not distribute the 3 to the 4 and -5a correctly.