Answer:

Step-by-step explanation:
I am assuming that you are asking what is [x] - 5 if f(86).
When you have this kind of question, what you do is to substitute the variable inside the parenthesis, so like what is says, f(x). If the question replaces the variable x with 86, that means you input the number into the equation.
So [x] - 5, if f(86).
Substitute:
86 - 5

60 because if w = 20, then you do 20 x 3 and 20 x 3 = 60
Answer:
so the final answer is =17
Step-by-step explanation:
9+12/3=13+4/2=2+1*2=2 the answer is 13+2+2=17
Answer:
The first one:)
Step-by-step explanation:
REMEMBER TO:
1. Give me Brainliest, please... (ASAP)
2. HAVE A WONDERFUL DAY!
Answer:
10x-22
Step-by-step explanation:
((x+2)(x-1))-((x-4)(x-5))
(x^2-x-2)-(x^2-9x+20)
x^2 + x - 2
+ (-x^2+9x-20)
_______________
10x-22