Need help ASAP please

Evaluate the expression for the given value of the variable 2×(c2-5) for c=4

The formula for the volume of a right square pyramid is given below, where a is the side length of the base and h is the height.

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.