N( 4 + 6 ) = 11 + 29
N( 4 + 6 ) = 40
N( 10 ) = 40
4( 10) = 40
N = 4
Hope this helps! :D
Answer:
Step-by-step explanation:
<u>Sum of n terms formula:</u>
<u>Solving for n</u>
f^-1(x)= -x/5 - 4/5