i got 2016 for the 10 billion one....
cus it was 1.14 increase every year. the population was 7.23 billion in 2014 right? so i did log 7.23/10 divided by log 1.14 which gave me 2.475 years plus 2014 so i just wrote 2016.... is it right?
for the interior angle one i got 45 i think but im not sure it its correct
i hope paper 4 is easier....