Answer:
7
Step-by-step explanation:
9 is not a prime factor and of you divide 210 with 11, it will be a decimal
PQS = 40 because if you look at the image above it half equals 20 and 20+20=40
The sum of f and 6 is simply f+6.
It is like this because f is a variable and we do not know its value.
