Answer:
Ken made a mistake A: Ken made a mistake between stepes 1 and 2.
Step-by-step explanation:
He distrubited it wrong he should have had 10y-2=18 thats how u already know he is wrong becaus eof how he distrubited it.
A
he actually made a mistake in second step. Step 2 should be: 10y-2=18 and then 10y=18+2
we get 10y=20 /:10
y = 2
114 cm2
See below
We want to prove that
Taking the RHS, note
Remember that
Therefore,
Once
Then,
Hence, it is proved