Answer:
<em>B=-3</em>
Step-by-step explanation:
<em>-11b+7=40</em>
<em />
<em>Subtract -7 from both sides</em>
<em>-11b-7=40-7</em>
<em>11b=33</em>
<em>divide by -11</em>
<em>11b/-11=33/-11</em>
<em>-11 and -11 cancel out, leaving you with B=-33/11</em>
thus B=-3
subtract 7 on both sides
40-7=33
-11b=33
divide -11 on both sides
b=-3
..........
side AB
12345824.4
I'm not really sure. I just did 1240x637x15.63=12345824.4
