The quadratic function f (x) = - 45x2 + 350x + 1,590 models the population of a city where x represents the number of years since 2005 and f (x) is the population of the city in thousands of people. What is the estimated population of the city in 2010?

2,215,000

Step-by-step explanation:

Given: The quadratic function models the population of a city where x represents the number of years since 2005.

To Find:  population of the city in 2010

We need to put x= 2010-2005 = 5

Hence, the estimated population of the city in 201 = 2215 thousands or 2,215,000 .

Original profit:

y = 22x ; where x is the number of necklaces sold and y is the mount of profit.

New pendant:

y = 29x ; where x is the number of necklaces sold and y is the amount of profit.

Xavier will earn an additional $7 if he proceeded in switching to a new type of pendant. The $7 is the difference of $29 and $22 profit.