Answer:
it is A trust me :)
Step-by-step explanation:
You can put 400/100 to get the fraction 4/1 or 4, it is not a mixed number though. So the final answer is 4
6x^5 - 11x^4 - 10x³ - 54x³ + 99x² + 90x
6x^5 - 11x^4 + (-10x³ - 54x³) + 99x² + 90x collect like terms
6x^5 - 11x^4 - 64x³ + 99x² + 90x simplify
hope this helps, God bless!