Given the following functions: *B(x) = 5x^4 + 8x^2 - 4x
*C(x) = -9x^4 + 4x^3 - 7x^2
*D(x) = -x^3 + 15x + 10
What is B(x) + C(x) + D(x)?
1. 14x^4 + 5x^3 + 15x^2 + 19x + 10
2. -4x^8 + 3x^6 + x^4 + 11x^2 + 10
3. -4x^4 + 3x^3 + x^2 + 11x + 10
4. 14x^4 + 3x^3 + 15x^2 + 11x + 10

Simonne used the following steps to simplify the given expression. 12-3(-2x+4) step 1: 12+(-)+(-3)(4) step 2: 12+6x+(-12) step 3: 12+(-12)+6x step 4: 0+6x step 5: 6x what property of real numbers was used to transition from step 3 to step 4? •identity property of addition •inverse property of addition •associative property of addition •commutative property of addition