Answer:
6
Step-by-step explanation:
If the sum of the digits of a number is divisible by 9, then the number is divisible by 9.
So 6+7+8+5+Δ+4 = Δ + 30 has to be divisable by 9, and of course 0≤Δ≤9
36 is divisable by 9, so Δ has to be 6.
X less than or equal to (< with the line underneath) -3 or x>0
The answer will be 7.50 because you are doing your times if you do divid its going to be hard so times to get your answer.
(8r+3s)(8r-3s) dont have working but noticed that it is the difference of two squares
