Shaun is planting trees along his driveway, and he has 4 eucalyptus trees and 4 poplars to plant in one row. What is the probability that he randomly plants the trees so that all 4 eucalyptus trees are next to each other and all 4 poplars are next to each other? Express your answer as a fraction or a decimal number rounded to four decimal places.

12. the amount of money in a bank account decreased by 21.5% over the last year. if the amount of money at the beginning of the year is represented by ‘n', write 3 equivalent expressions to represent the amount of money in the bank account after the decrease?

One file clerk can file 10 folders per minute. a second file clerk can file 11 folders per minute. how many minutes would the two clerks together take to file 672 folders?

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?