Answer:
b-2=n
Step-by-step explanation:
4r^-3 * 2r^2 =
4*(2r^(-3+2))
= 4*2r^-1
= 4*2(1/r)
= 4*(2/r)
=8/r
Answer:c
The answer would be 12%
250-220=30 and 30 is 12% of 250