Answer:168
Step-by-step explanation: First you do 82 times 3.75 which is 307.50. Then you do 2071.5 - 307.5 = 1764 Then you do 1764 divided by 10.50 which is 168
Divide I from both sides then subtract r from both sides, too so in the end:
R= (E-r)/I
That does not make sense sorry :(
Area = πr^2
π4^2 =16π
=50.3