Answer:
The correct option is a. 8.75.
Explanation:
Given:
f(x)=[2.5x] .............................. (1)
Where;
x = 3.5
The function can be evaluated by substituting x = 3.5 into equation (1), we have:
f(3.5) = 2.5 * 3.5
f(3.5) = 8.75
This implies the value of the function is 8.75. Therefore, the correct option is a. 8.75.