Question

Help me step by step serious answers please

Answer 1

the bottom one to the very right is 20

the one in between the -4 and 2 is 24

the one above 20 and 16 is 36

the one above the 2 and 24 is 26

the one above 20 and 26 is 46

and the one above the 26 and 46 is 72