The air quality index, or aqi, measures how polluted the air is in your city and assigns a number based on the quality of the air. over 100 is "unhealthy".

the following quadratic regression equation, models the aqi over time, where n represents the number of days the aqi exceeded 100, and t represents the number of years since 1990.

estimate the number of days the aqi exceeded 100 in the year 2002. round to the nearest whole day. (hint: t = 0 corresponds to the year 1990.)

a.
281 days
b.
97 days
c.
135 days
d.
52 days

Data from 2005 for various age groups show that for each $100 increase in the median weekly income for whites, the median weekly income of blacks increases by $105. also, for workers of ages 25 to 54 the median weekly income for whites was $676 and for blacks was $527. (a) let w represent the median weekly income for whites and b the median weekly income for blacks, and write the equation of the line that gives b as a linear function of w. b = (b) when the median weekly income for whites is $760, what does the equation in (a) predict for the median weekly income for blacks?

Consider the following function. which of the following graphs corresponds to the given function? w. x. y. z. a. z b. y c. x d.

Which of the following is the sum of 3 1/6 + 6 3/8?