Where's the figure? In order for me to help I'll have to see the figure
For this case we must factor the following expression:

We must find two numbers that, when multiplied, result in 9 and when added, result in -6.
These numbers are -3 and -3.

Then, the factored expression is of the form:

Thus, the correct option is option C.
ANswer:
Option C
Total height of the cake and the candles is 17.1 cm
Step-by-step explanation:
- Step 1: Convert the mixed fractions into decimal expressions.
11 7/10 cm = 117/10 = 11.7 cm
5 4/10 cm = 54/10 = 5.4 cm
- Step 2: Find total height of the cake and the candles
Total height = 11.7 + 5.4 = 17.1 cm