Which of the following describes an economy?
a.
more food than is needed to feed a group
b.
when people are able to spend their time working at one craft or job
c.
a system that a community uses to make and give out goods and services
d.
a supply of something that can be used as needed
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C. A system that a community uses to make and give out goods and services.

sir thomas more, venerated in the catholic church as saint thomas more, was an english lawyer, social philosopher, author, statesman, and noted renaissance humanist. he was also a councillor to henry viii, and lord high chancellor of england from october 1529 to 16 may 1532.

the perimeter of a triangle is 69 cm. side a is 5 cm shorter than side b. side c is twice as long as side a. find the length of each side. i need to know how to do it in 2 equations.  

equations:

a = b-5

c = 2a

a + b + c = 69