simplify the following polynomial expression.
B%28-2x%5E%7B3%7D%20%2B3x%5E%7B2%7D%20-7x%2B9%29-%285x%2B3%29%284x%5E%7B2%7D%20%2Bx-1%29" id="TexFormula1" title="(5x^{3} +4x^{2} +6x-3)+(-2x^{3} +3x^{2} -7x+9)-(5x+3)(4x^{2} +x-1)" alt="(5x^{3} +4x^{2} +6x-3)+(-2x^{3} +3x^{2} -7x+9)-(5x+3)(4x^{2} +x-1)" align="absmiddle" class="latex-formula">
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Answer:
2hrs 40 minutes
Step-by-step explanation:
The formula for distance is expressed as:
#The time taken to run:
#The time taken to walk:
#Since the distances are the same:
Hence, Dana spends 2hrs 40 minutes walking back