It`s either 100,000 because there is only four 0`s making it 70,000 or it`s 700,000 and you made a mistake of not typing that last zero in which case the question would be pointless to ask because the answer is in the question.
Its b because to simplify radical you multiply by in this instance sqrt of 5 on the denominator and numerator
Y=2.50x+20. Plug in values for x starting at 0 and you will get values for y and then graph.
Answer:
6 x 3 = 18 + 2 = 20/3
3/4 X 3/20 =
3 X 3
-------- = 9/80 already simplified to lowest
4 X 20