take 12th root of 2.84, you will need your calculator
1+x = 1.090879
x = .090879
solve
2.84 = (1 + x ) ^ 12
2 answers
2.84= (1+x)^(12)
2.84^(1/12)=[(1+x)^(12)]
2.84^(1/12)=1+x
1.09088=1+x
0.09088=x
2.84^(1/12)=[(1+x)^(12)]
2.84^(1/12)=1+x
1.09088=1+x
0.09088=x