Do 4x9+5 because you multiply 4 and c and then add on d.
Idk exactly what your question is asking, but I think you are doing genetics? If you are then you are talking about a punnet square. All four boxes should be heterozygous(Cc). Hope this helps.
Remember: We have to work from either the LHS or the RHS.
(Left hand side or the Right hand side)
You should already know this:

You should also know this:

So plugging in both of those into our identity, we get:

Simplify the denominator on the LHS (Left Hand Side)
We get:

LHS = RHS
Therefore, identity is verified.
Step-by-step explanation:
He has done one half = ½
Finding ½ of 14
½ × 14
7
Hence, Hong has memorized 7 words