Modeling with Rational and Piecewise-Defined Functions: Part Two — Test
Question 12 • Precalculus
If f of x is equal to 3 lfloor x minus 2 rfloor , what is f of 5 point 9 ?
Answer
A
10
B
12
C
9
D
11
Explanation
Substitute 5.9 for x inside the floor function: 5.9 − 2 = 3.9. The greatest integer less than or equal to 3.9 is 3, so f(5.9) = 3 × 3 = 9. The correct choice is 9.
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