Answer:
1.8 × 10^10
Step-by-step explanation:
(7.2 × 10 = 72)
(72) ÷ (4 × 10^-9) = 1.8 × 10^10
The correct anwer is -21 and how i got that is by taking -7*300 to get -21 as my answer let me know if it helped any...
D) 36x^2-81
both 36x^2 and -81 are perfect squares
difference means subtraction
Answer:

Step-by-step explanation:
<u>Step 1: Multiply
</u>




Answer: The correct answer is -1
The answer to the question is C