Answer:
Step-by-step explanation:
you didnt give an equation, that is required, Thanks!
formula I=Prt
450= (3000) r (3)
450=9000r 450/9000=9000r 0.05=r
H - 21 = 52
Move 21 to the other side and add it to 52
That is what H is equal to.
H = 52 + 21 = 73.
I am pretty sure it is A- The energy of a photon is h x c.