Answer:
science budo but nucleus controls cell activity and contains dna
90kg
It is just a simple proportional problem. If you subtract 10%, then you subtrat 10 kg.
B has the equation -2 + 7 = -5
C has the equation -7 + 5 = -2
D has the equation 5 + (-7) = -2
The mean is the average, so add all the numbers and divide by 7 (7 terms).
-14 is the sum, divided by 7 = -2
The mean is -2.