HELP ASAP PLS I NEED TO KNOW THIS!

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

What is the perimeter of a rectangular building that is 80 feet wide and 140 feet deep?

He weights of 2-pound bags of best dog food are approximately normally distributed with a given mean  and standard deviation  according to the empirical rule, what percentage of the bags will have weights within 3 standard deviations of the mean? 47.5%68%95%99.7%