Answer: 
Step-by-step explanation:
We know that Scientific notation is a way to write a very large or a very small number in the product of a decimal form of number [generally between 1 and 10] and powers of ten.
Given number : 0.00023
In scientific notation 
Therefore, In scientific notation 
Answer:
I think it is the rectangular prism and square pyramid
Step-by-step explanation:
12x12x16=2304 it is the greatest
Answer: 109
Step-by-step explanation: add 19.95 to 79 then subtract it from 221.97