During the early part of the 20th century, French brothers Auguste and Louis Lumière patented one of the first photographic color processes. The system involved coating a glass with microscopic grains that had been dyed colors like green, violet, and orange. These dyed grains acted as a filter for the image being photographed. What was this photographic process called?

d. the right to establish a one-house legislature

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

interest groups send representatives to state capitals and to washington, d.c. to put pressure on members of congress and other policymakers. they engage in lobbying, or the organized process of influencing legislation or policy. lobbying can take many forms. interest groups can testify in congressional hearings.

this question shoud be under spanish category, not