I need help on this, anything will help!

If f(x) = 6x – 4, what is f(x) when x = 8? a2 b16 c44 d52

What number is 7 units left of -15?

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.