Simplify the polynomial expression given below. (2x − 1)(2x2 + 5x + 3) + (3x + 6) The first step is as follows: 2x(2x2 + 5x + 3) − 1(2x2 + 5x + 3) + (3x + 6) 4x³ + 8x² + 4x + 3 4x³ + 8x² + 14x + 9 2x² + 24x + 6

Now, martin can reasonably guess that the standard deviation for the entire population of people at the mall during the time of the survey is $1.50. what is the 95% confidence interval about the sample mean? interpret what this means in the context of the situation where 95 people were surveyed and the sample mean is $8. use the information in this resource to construct the confidence interval.