Question

Please help last question to pass with a 70%

Answer 1

Using pythogorus theorem 
a=root of 8^2-4^2
a=root48
a=6.9 which is equal to 4root 3
Therefore your answer is F

Answer 2

A^2+B^2=c^2, c=8 a=4 solving this will give you b=radical 48 this equals radical 3 times radical16 which equals 4 radical 3