number of accidents

Question

The number of taxi accidents is approximated by y=−143.3x2+1823.3x+6820
and the number of injuries is approximated by y=−416.72x2+4416.7x+8500.
Let x=0 represents 1990, x=1 represents 1991, and so on.
According to the equation for the number of accidents, if the trend continued, how many taxi accidents occurred in 1999?

 

Year     Number of accidents
1990      6,820
1993      11,000
1996      12,601

Answer 1

First, I have edited one of the key sentences: Let x=0 represents 1990, x=1 represent 1991, and so on.

 

According to what I see here, you simply substitute x=9 for year 1999, and calculate the y value (from the first function stated). Round up to an integer.