A retailer spends $500 per month to keep its online shop active and updated. The store acquires shirts at a marginal cost of $5 per shirt. Each shirt sells
for a marginal benefit of $10 per shirt.
What is the minimum number of shirts the retailer needs to sell in order to
pay for all its costs in a month?
Quantity of shirts sold Marginal cost Total cost Marginal benefit
0
$0
$500 $0
25
$125
$625 $250
50
$250
$750 $500
75
$375
$875
$750
100
$500
$1,000
$1,000
125
$625
$1,125
$1,250
O A. 100
O B. 25
O c. 125
O D. 75

according to classical republican political theory, which democratic republics would function best?

a.   small republics, with people who had similar interests

b.   large republics, with people who had competing interests

c.   republics made up entirely of landowners

d.   republics made up entirely of servants

question - in 1827, john walker, a druggist in a small english town, tipped a splint with sulphur, chlorate of potash, and sulphid of antimony, and rubbed it on sandpaper, and it burst into flame. the druggist had discovered the first friction-chemical match, the kind we use to-day. it is called friction-chemical because it is made by mixing certain chemicals together and rubbing them. although walker's match did not require the bottle of acid, nevertheless it was not a good one. it could be lighted only by hard rubbing, and it sputtered and threw fire in all directions. in a few years, however, phosphorus was substituted on the tip for antimony, and the change worked wonders. the match could now be lighted with very little rubbing, and it was no longer necessary to have sandpaper upon which to rub it. it would ignite when rubbed on any dry surface, and there was no longer any sputtering. this was the phosphorus match, the match with which we are so familiar. according the paragraph what was the benefit of the new phosphorus match? it burst into flame when rubbed on sandpaper. it was made by mixing chemicals. it could be ignited on any dry surface. it threw fire in all directions.

answer - matches required natural chemicals

light has energy and momentum and so the beams are ever so slightly attracted to each if they had mass. they will ever so slightly curve space.

reference