Answer:
(d) 6
Step-by-step explanation:
The degree of a composition of polynomials is the product of the degrees of the contributing functions.
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f(g(h(x))) = -(3(2x+5)² -1)³
f(g(h(x))) = -1728x⁶ -25920x⁵ -161568x⁴ -535680x³ -996336x² -985680x -405224
The degree of (f∘g∘h)(x) is 6.
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3×2×1 = 6
