What was the difference between thomas newcomen's and james watt's steam engine? .

The steam engine of Thomas Newcomen and James Watt used the same principle of creating a vacuum  and using steam to drive the device. The difference is that in James Watt's version, he uses a separate condenser to allow for a much greater efficiency in terms of power. The main difference with a separate condenser is that with a separate condenser, the main device can remain hot at all times, thus increasing efficiency.

adopted the practice of proskynesis, a persian court custom that involved bowing down and kissing the hand of others, depending on their rank.

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