)if cigarettes are priced at $7 a pack, how many packs will smokers buy? (b) if secondhand smoke creates $2 of harm per pack, what is the optimal rate of smoking? (c) how large a tax is needed to achieve this outcome?

They won't because you shouldn't smoke . I should know my dad's a smoker and he smokes 2 packs a day . when you do you inhale tar , carbondioxide , bezel . tar - the roads carbondioxide - chemicals bezel - very toxic stuff possibly found in cleaners it makes a fat substains that makes heart blockage, lung cancer ,brain cancer ,heart disease, gum disease ,oral cancer and half of the smokers in this world die from smokeing now my point is of telling you this is that you share this with people so that they DONT smoke . thank you,                                         Autumn

whats the

- "runner b is moving at a slower rate."

- "the graphs shown are graphs of distance(km) against time(min).

the slopes of this graphs are are given by:

slope = (change in y)/(change in x)

= (change in distance)/(change in time)

this is the formula for finding the speed. so, the slope of these graphs represent the speed of the runner.

taking each division in the graph to represent 1 on both axis:

runner a ⇒ speed = (2-0)/(1-0)

= 2/1

= 2 km/min

runner b ⇒ speed = (3-0)/(3-0)

= 3/3

= 1 km/min

this shows that   runner b is moving at a slower rate."