3a) no. 2n equals to n multiplied by two while 2+n equals to n plus 2.
b) no unless n equals zero
c) no. let's say n equals 2. then 2n+n equals 6 whilst 2(n+2) equals 8.
d) not unless n is zero. other than that 2n^2 will never equal (2n)^2.
patterns: column c is always half of column e. even if n equals zero. column f is half of column g and column g is half of column h. therefore column f is one quarter of column h. this only applies of n equals zero.
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