Help can you help on this​

Tom travels between the two mile markers shown and then finds his average speed in miles per hour. select the three equations that represent this situation.

If f(x)=3 over x+2 - square root x-3 then f(7)=

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.