Pls help with algebra 1 hmk!!

Write the expression as a single natural logarithm. 2 in a - 4 in y

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.

Factor this polynomial completely. x^2-8x+12