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A. (a + b)(x) =a(x)+b(x) = 4x + 9+<span> 3x − 5 = 7x - 4
B. </span>(a ⋅ b)(x)= a(x)*b(x) =(4x + 9)( 3x − 5 )= 12x²+27x-20x-45 = 12x² +7x -45
C. a[b(x)] = 4(<span>3x − 5)</span> + 9 = 12x-20+9=12x-11
12*13*14*15*16 = 524160
Idk how to get this answer actually. It's just my first guess, and it happened to be right.
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Answer: X it's called a "variable" or sometimes an "unknown" but a variable doesn't have to be "x", it could be "y" , "w" or any letter, name or symbol...