I believe the answer is C
Answer:
Explanation: response goes to last under goes to first the last one goes to the last one
So with this equation, you have to work inside out with the parentheses. Firstly, solve 3+4: ![\{30-[12-7+2]*2\}-15](https://tex.z-dn.net/?f=%20%5C%7B30-%5B12-7%2B2%5D%2A2%5C%7D-15%20)
Next, solve 12 - 7 + 2: 
Next, solve 7 x 2, then 30 - that product: 
Lastly, solve 16 - 15, and your answer will be 1.
Answer: 3 attempts!
Explanation: hope this helps!