Respuesta :

pianoheart
To find the answer, plug in 5 into the inequality. 
3(5)<21
15<21 
Since 15 is less than 21, we know that 5 is a solution. 
texaschic101
lets see...

3(5) < 21
15 < 21...so is 15 less then 21...yes...so 5 is a solution