1st person to answer gets which expression represents 25x^2-81in factored form, and how? a.(5x+3)(5x-3)b.(5x-9)(5x-9)c.(5x+9 )(5x-9)

C. (5x+9)(5x-9)

Step-by-step explanation:

This is because of the difference in squares formula:

Realize that is the difference of two squares, and 81. This means that we can use the formula for the difference of two squares, which is:

In this case, we can say and . Taking the square root of both sides of the equations means that we will get the following:

Using our formula for the difference of squares, we get:

Thus, the answer would be Choice C, or (5x + 9)(5x - 9).

4+n=5

step-by-step explanation:

this is because the four is four hours and the n represents the 1 extra hour over the weekend.

b= i'm srry i don't know that one.

4+n=5 n=1 because if vernon plays 5 hours a week then 4+1=5 hours.

hope this : )

c

step-by-step explanation: