What is the missing entity labeled "a" in the following formula, in order for the formula to represent a fusion reaction? (a) 3h (b) 4he (c) 2h (d) 3he or (e) light energy 2h + "a"→ 4he + n + energy, where n is a neutron and he is helium be sure to explain your answer.

the value of the 4 in the hundreds place is 400 while the value of th e 4 in the tens place is 40

400 is way bigger than 40.

the answer would be the third option, "no, ariel should have added 9^2 and 12^2 and compared that to 15^2."

this is found through the pythagorean theorem, which is a^2 + b^2 = c^2.

this is the correct way of solving the problem:

9^2 + 12^2 = 15^2

81 + 144 = 225

225 = 225