Question

what should be added to 9t⁴-12t³+3t²-4 os that t²+2t-1 is factor of it​

Answer 1

The answer is:

The second option, Denver received 21.3 inches of snow during the period from 1888 to 1889.

Why?

To know how many inches of snow did Denver receive, we need to sum each the number of inches received per year from 1888 to 1889.

So, from the graph, we have:

For Nov '88, 3 inches.

For Dec '88, 0.8 inches.

For Jan '89, 5.5 inches.

For Feb '89, 8.4 inches.

For Mar '89, 3.6 inches.

Now, adding the number of inches for each month/year, we have:

Answer 2

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see in above attachment.

hope it is helpful for you ✌