Question 98211
6 ≤ 3t - 3 ≤ 21 
You need to first isolate the 3t, since 3 is being subtracted from 3t, we will add it to all sides;
6+3 ≤ 3t -3 +3 ≤ 21 + 3
9 ≤ 3t ≤ 24
Now isolate the t by dividing each side by 3;
{{{9/3}}}≤{{{3t/3}}}≤{{{24/3}}}
3 ≤ t ≤ 8
:)