There are a few meanings, well it like when u log in to a website or when u sign in (register in/login)
A^2 -121 = a^2 -11^2 = (a-11)(a+11)
so the second choice is right sure
L=length, w=width
l=2w+5
2l+2w=34
2l=4w+10 [here I just multiplied the first equation by two]
4w+10+2w=34 [substitute 4w+10 for 2l]
6w=24, w=4
remember l=2w+5 so l=2(4)+5=13
Answer: The length is 13.
Given that:
Membership feet to play indoor soccer at the Sun Oaks Club = $100
Hourly rate = $10
To find:
The function f represents the cost of playing soccer at Sun Oaks.
Here, fixed cost is $100.
Let the number of hours of playing be t. So, total variable cost is $10t.
Total cost = Fixed cost + Variable cost

So, the required function is
.
Now, if the hourly rate were halved. Then,
Hourly rate 
So, total variable cost is $5t and total cost function is

So, the required function is
.
Answer:
I think it is f-180+d I did this problem and I got this answer but if not correct I a. sorry