Answer: 2
Step-by-step explanation:
5-3=2
30-5=15
<span>What is 6 [4•(72-63)÷3]?
</span><span>6 [4•(72-63)÷3]
</span>
=72
In the attachement, there is what I came up with so far. I think that finding 'a' is non-trivial, if possible at all.
- the area of a circle
- the area of a circular segment
Problem A,B,C, and D can be solved using 3*6=18 or 6*3=18