4
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2a 4 is the same as saying 2*a*4, so if you plug 2 in for a, this equals 16
Simple algebra, 2a-20 = -2 2a=18 a=18/2 a=9
We have, 2a + 24 = 30or, 2a = 30-24or, 2a = 6or, a = 6/2 = 3.Therefore, a equals 3 or simply a=3
-2a + 5 = 1 -2a = -5 + 1 -2a = -4 a = -4/-2 a = 2
-2a - 4 = -16.8 -2a = -12.8 a = -12.8/-2 a = 6.4