It be 81.
You have to take half of -18 which is -9, and square that, which is 81.
First, incorporate the 5 into the 2/3 fraction by multiplying the 5 by the 3 and then adding that quantity by the 2, which now makes the fraction:
17/3
Now set it up with the equation:
r/6 = 17/3
r/6×3 = 17/3×3
r/3 = 17
r/3×3 = 17×3
r = 51
Good luck my G. I gotta answer 2 questions so I can post pics of my test