You have to plug in the numbers for x and then solve.
For example, when it says y=2x-4, you put -2 and the numbers below it for x and then solve.
(I don't want to give you the answer to everything and want to help you understand how to do it.)
Answer:
132
Step-by-step explanation:
99 ÷ 3 equals 33. 33x4 equals 132
Answer:
It looks the same but it can be smaller or big and they both look the same shape.
Step-by-step explanation:

Multiplication by 10ⁿ → move decimal n places to the right.
Multiplication by 10⁻ⁿ → move decimal n places to the left.
For n ∈ N