(7/2) to the negative second power

(7/2)^(-2) = (2/7)^2

note how I took the reciprocal of the fraction to make the exponent positive. The rule is (a/b)^(-c) = (b/a)^c

Then we square each piece of the fraction 2/7 getting

(2/7)^2 = (2^2)/(7^2) = 4/49

4/49 is approximately equal to 0.08163265306122

your question is incomplete, write all the numbers in the sequence that it tells you.  

step-by-step explanation: