The first answer is right
(x - 9) (x + 9)
It’s me again lol
The sum is 20 okay by the way it’s wrong u
Answer: 2.25x

Scientific notation is used in science because the number can be vary from so much that using decimal is making it hard. The number expressed in

form. Both number in the question is already in scientific notation. Then to multiply the number and keep it at scienfitic notation the calculation should be:
2.5 x

x 9 x

= 22.5 x

= 2.25x
Answer:
That I have no idea what it is. sorry
Step-by-step explanation: