Question

3f + 9 < 21 Help please

Answer 1

Answer:

$\boxed {f < 4}$

Step-by-step explanation:

Solve the following inequality:

$3f + 9 < 21$

-Subtract $9$ on both sides:

$3f + 9 - 9 < 21 - 9$

$3f < 12$

-Divide both sides by $3$:

$\frac{3f}{3} < \frac{12}{3}$

$\boxed {f < 4}$

Answer 2

Answer:

f < 4

Step-by-step explanation:

3f + 9 < 21

21 - 9 = 12

12 / 3 = 4