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3 years ago

3f + 9 < 21 Help please

Mathematics

2 answers:

Arte-miy333 [17]3 years ago

6 0

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 $3$ :

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

$\boxed {f < 4}$

fiasKO [112]3 years ago

4 0

Answer:

f < 4

Step-by-step explanation:

3f + 9 < 21

21 - 9 = 12

12 / 3 = 4

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