Answer:
2x+10
x=55
Step-by-step explanation:
Perimeter = 2(5+x) = 2x+10
SECOND QUESTION
2x+10=120
2x=110
x=55
f(x) = -5x - 4
substitute the value of x = 5 to the equation of the function:
f(5) = -5(5) - 4 = -25 - 4 = -29
Answer: B. f(5) = -29
The answer is 10
Hope this helps have a nice day ;)