What did carnegie do to ensure that his money would be used to society?
a. he contributed to medical research.
b. he built libraries that everyone could use.
c. he offered music appreciation classes for everyone.
d. he gave away money to homeless people.

The correct answer is B. He built libraries which everyone could use.

Andrew Carnegie was known for his work which he led American to the expansion of steel industry. He was among the richest people.

In both the British empire and united states he was a philanthropist. His first job was a telegrapher, whereby later he invested in railroad sleeping cars, bridges, oil derricks and railroad.

He gained his wealth when he started job as a bond salesman where he raised money for enterprise in america which is in Europe.

i am pretty sure the awsers is d.

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