The answer is b=P-a-(n+1) all you had to do was the a and the parenthesis from the b and put it on the other side
You can cross multiply fractions only if there is an "=" sign in the middle of the two fractions.
Given that Bill
is on the school archery team. the target has a center bull's-eye and
two rings around the bull's-eye.
Given the table below that gives the probabilities of outcomes.

The probability <span>that Bill will get the next arrow in the inner or outer ring is given by
P(inner ring) + P(outer ring) = 0.297 + 0.423 = 0.72</span>
Therefore, <span>the probability that Bill will get the next arrow in the inner or outer ring is 0.72</span>