Answer:
20 min
Step-by-step explanation:
5 is 1/3 of 15
That means that the time is 1/3 of a hour which is 20 min
Since the equation has a degree of 5 then, it will definitely have 5 zeroes. Complex zeroes of the polynomial always come in pair such that even if there are five zeroes, the complex zeroes could only be either 2 or 4 or none.
Hence, the answer to this item is none, 2 or 4.