Pls me with 4 and 5 and explain how u did it

the mistake in the pattern is that :

b. the decimal point was moved one too many place values each time

the correct pattern could be made by :

b. moving the decimal point to the right the same numbers of place values as the exponents

51

step-by-step explanation:

73-22=51 the   mass number minus the amount of protons gives you the amount of neutrons