75 points and brainiest to whoever answers these 4 simple geometry questions right explain

Add the fractions, and simply the result to lowest terms. 2/3 + 2/7= ?

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.

What is the answer to this equation? and if you can, find a way to show your work.