Question

3f + 9 < 21
Help please

Answer 1

f < 4

Explanation:

3f + 9 < 21

21 - 9 = 12

12 / 3 = 4

Answer 2

`\boxed {f < 4}`

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`:

`(3f)/(3) < (12)/(3)`

`\boxed {f < 4}`