domain is the numbes you are allowed to use for x
what I usually do is just find the numbers that aren't allowed in the domain. such numbers are numbers that cause a division by 0 or a squaer root of a negative number
given 
, there are no numbers that you can use for x that will cause a division by 0 or a square root of a negative number
so domain is all real numbers or D={x | -∞<x<∞}
It will be 115 because it adds up to 180
I figured out that number 4 is probably alternate angles. Sorry I couldn't be much help :)
1st page: 580
2nd page: 576
in the 1st two pages: 580+576 = 1156
total word = 2000
total word = words written + words to write
2000 = 1156 + words to write
subtract 1156 from each side
2000-1156 = words to write
844 = words to write
Choice D
