ANSWER
B. 1
EXPLANATION
The given function is

This is a piece-wise defined function.
We want to find f(1)
We substitute x=1 into f(x)=x because, 1 belongs to the interval,
1≤x≤5
f(1)=1
The correct answer is B.
Answer:
t ≤ 15
Step-by-step explanation:
t - 3 ≤ 12
Add 3 to each side
t-3+3 ≤ 12+3
t ≤ 15
The correct answer here is A. (3, 21) because when you graph these equations, you will find the lines intersect at this point and only this point.
B is a factor of the equation above because if you do 3a^2 + 17a + 10 you would get (3a +2) (a+5)