The answer is the option C and the option D, which are:
C. Double the number of pages in the book.
D. The age of my friend.
The explanation for this problem is shown below:
By definition, a variable is an unkown quantity. In the Option A the quantity is given: 
seconds in a minute. In the option B you know the quantity too, which is 
years old. But the option C and the option D does not give any quantity, you don't know the number of pages in the book or the age of the friend yet. Therefore, the answer is the options C and D.
Answer:
Area = 64
Step-by-step explanation:
area of a square = 
side length = 8
= 64
We are given 85
Firstly, we will find all possible factors of 85
we can write it as
so, exponential form is
................Answer
Answer:
The answer is , The arrows should start at zero .
Step-by-step explanation:
You can either use a caculator or use pencil and paper if you know how to times the numbers line them up then time it ill show you
