You do the inverse operation for each one. so for #14, since 25g is multiplication you divide it by 25 to cancel it out, then you divide -175 by 25 which gives you -7
Well you could round it to the 4th decimal, which would be 2.7183
That as a mixed number would be
I did know of the understanding of math high school?
Answer:
option A, Estimation gives an approximate answer