Ecologists estimate that, when the population of a certain city is x thousand persons, the average level l of carbon monoxide in the air above the city will be l ppm (parts per million), where upper l 80 + 0.4 x + 0.0006 x squared. the population of the city is estimated to be x 752 + 23 t + 0.5 t squared thousand persons t years from the present. find the rate of change of carbon monoxide with respect to the population of the city, and the time rate of change of the population when t2. how fast (with respect to time) is the carbon monoxide level changing at time t2?

the answer is d

step-by-step explanation:

a. turk and mcalister

b. howard, mission, and market

c. yes. since streets end some do not cross yet are not parallel to others. example: mcalister and 5th

step-by-step explanation:

parallel lines are lines which do not intersect ever and look a lot like railroad tracks. turk, mcalister and golden gate are examples of these.

intersect are streets which cross each other and a car on one can reach the other. howard, mission, and market intersect with 6th.

skew lines are lines which neither intersect nor are parallel. these lines exist here because some streets end and never intersect another like mcalister and 5th.