12)
3x + 12 - 5x + 10 ≥ 18
-2x + 22 ≥ 18
-2x ≥ -4
x ≤ 2
13)
A (4 6 8 10 12) = 5
5C3
= 5 ! /3 ! 2 !
= 20/2
= 10
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12)
3x + 12 - 5x + 10 ≥ 18
-2x + 22 ≥ 18
-2x ≥ -4
x ≤ 2
13)
A (4 6 8 10 12) = 5
5C3
= 5 ! /3 ! 2 !
= 20/2
= 10