Can someone help me it is math please I will mark brainlist

The difference of a number and seven → n - 7The sum of seven and a number → n + 7The product of seven and a number→ 7nThe quotient of a number and seven →  

Step-by-step explanation:

Difference = subtraction, so the difference of a number and seven is n - 7Sum = addition, so the sum of seven and a number is n + 7Product = multiplication, so the product of seven and a number is 7nQuotient = division, so the quotient of a number and seven is

I hope this helps!

Maybe the answer is 20mm. all i really did was just multiply, which is obvious.