Find the nth term of this quadratic sequence
4 7, 12, 19, 28

Find the average speed of a rabbit that runs a distance of 22 m in a time of 1.8 s .

If tan2a=cot(a+60), find the value of a, where 2a is an acute angle

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?