You would:
31.36 divided by pi and that will give you r2
you would then need to divide r2 by 2 to get the radius and there is your answer
I got:
9.982 for the first part
then 9.982 divided by 2= 4.991 for my final answer
I hope this helps
a)
30.65^2/(2*5.15)=91.2061
d=91.2061
b)i)90
ii) Mathswatch is critical of anything apart from it's system so I dont know what the answer is for this one
30-30-15+10 Henry starts with 30, loses 10, and then another 15. Than his sister gives him 10.
Value of x is 10 duhhhhhh