The green arrow thing is a ray. So, question b. is a ray. So the dot would be B and the arrow would be C.
Evaluate p2 - r2 for p = 10, r = -4 and t = 5.
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Lets just use 
for an example. If the number is increased by 60% and the denominator is decreased by 20% we get the new fraction being: 
. Since then new one is equal to 1, and the original is equal to 
, we see that this manipulation of the fraction causes an increase of 100%.