What is the value of the fourth power of ten

Identify the initial amount a and the growth factor b in the exponential function. a(x)=680*4.3^x

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?

Describe the graph of 3x+2> 2 and 3x< 6