If my son was born june 2016 what year will he graduate high school

Since the child was born in 2016, he will be 6 years old in 2022. Twelve years after he will be 18 in 2034.  This should be his school graduation year.

1. 0.3 •4 is the same as 4 groups of 0.32. 7•0.8 is the same as 7 groups of 0.83. it increases by 0.5 every time, so 0.5x4 it increases by 0.9 every time, so 0.9x5. 0.9•12=10.86. 0.47•5=2.35i can finish the next ones in a separate post