I cant see 5th question....
Rest are attched below
Rest are attched below
How many time greater is 7,000 than 700?
2 answers:
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Use Pythagoras theorem
Two triangles are similar
(6+3)*12/2 - 6*8 /2 = 30
Two triangles are similar
(6+3)*12/2 - 6*8 /2 = 30
we know that
total of sum of arc is 360
so, sum of both arc must be 360
so, we get
now, we can solve for x
............Answer
The period of a sinusoid 
is 
, so any range such that 
will give two complete periods.