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24+16+5-40= 5 (A)
15.
4x²-5x-6= (4x+3)(x-2)
(B)
16.
3²=9 (C)
17.
f(x)= 11-3x
f(2a-3)= 11-3(2a-3)
= 11-6a+9
= 20-6a (C)