Answer:
Sum means to ADD in the math world
Step-by-step explanation:
So your answer would be d + 9
The answer is a because when u divide that number by 6 u get a whole number
Answer:

Step-by-step explanation:
Let the
be the first number,
be the second number and
be the product of the first and second number.
i.e




Now,

Hence, 
Answer:
7:3
Step-by-step explanation:
Divide both sides by 4
3.75 divided by 3= 1.25
3.75-1.25= 2.50