Answer:
5.41
Step-by-step explanation:
14.18 because you do pi times the radius squared and divide it by 2.
3x+1/10=x-1/7
subtract 1/10 from both sides
3x=-1/7-1/10+x
subtract x from both sides
2x=-1/7-1/10
add -1/7 and -1/0
1/7=10/70
1/10=7/70
-10/70-7/70=-17/70
2x=-17/70
divide by 2 ro multiply by 1/2
x=-17/140
I think you got confused with the 50 and 90.
Read my NOTE there it will surely help you answering other questions like this