I happen to be the happy father of a proud 8 year old.
Looks like we used the
We also used
If $a=b$, then $P(a)=P(b)$
$26=20+6$, so $26+4=(20+6)+4$.
(20+6) + 4 = 20 + (6+4)
Looks like we threw in the
Note how similar this is to the last question.
In fact, if $x=10$, this is the last question.