Answer:
(2x-9)(2x+9)
Step-by-step explanation:
This is a difference of squares because it can be written as (2x)^2-9^2
The formula for factoring a difference of squares is a^2-b^2=(a-b)(a+b)
So replace a with 2x and b with 9 giving us
4x^2-81=(2x-9)(2x+9)
Answer:
1 999 000
Step-by-step explanation:
Formula:

………………………………………
Then




Answer:
60%
Step-by-step explanation:
9/20 is 45%
A. is 20ft I believe but I don't know the other one
Answer: Yes. The cookies are $ .75 each. The total cost is proportional to the number of cookies purchased.
T = $.75 × c
Step-by-step explanation: