First write subtraction with a common denominator then subtract

Bring the fraction a/a-4 to a denominator of 16-a^2

What is the location of point g, which partitions the directed line segment from d to f into a 5: 4 ratio? –1 0 2 3

1. according to the internal revenue service, the mean tax refund for the year 2007 was $2,708. assume the standard deviation is $650 and that the amounts refunded follow a normal probability distribution. a. what percent of the refunds are more than $3,000? b. what percent of the refunds are more than $3,000 but less than $4,000? c. what percent of the refunds are less than $2,000?