18 . it's increasing by 5 every time so the next one after 23 is 28
A b is no slope and kL is undefined
You just multiply top times top and bottom times bottom and then find a number you can divide into the number and you keep doing that until you can't simplify any more.
The equation would be:
x - 9 < 4
Simplify (add 9)
Solution: x < 13
The percentage would be 73% but idk the rest