Which of the following expressions is not in its simplest form?
9m + 7n - 6mn + 4
m + 3n + 6mn - 4
9m + 7n - 6mn + 4m
7m - 9n - 6mn + 4

answer:   n ≤ -3 or n < -5

step-by-step explanation:

-5 + 2n ≥ -11

+5             +5

2n ≥ -6

2/2 ≤ -6/2

n ≤ -3

-6 - 10n > 44

+6           +6

-10n > 50

-10/-10 50/-10

n < -5

so, converting firstly the mixed fractions to improper fractions and then "adding".

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