phone hut had a sale on phones for five weeks. during week 5, they sold 787 more phones than they did week 4.how many phones did phone hut sale during week 4 and 5?

All per-unit concepts rely on ratios,meaning,to provide a type of measurement

The number of potato chips in a bag is normally distributed with a mean of 71 and a standard deviation of 2. approximately what percent of bags contain between 69 and 73 potato chips? approximately 68% approximately 71% approximately 95% approximately 99.7%

Can someone me do math because i am having a breakdown rn because i don’t get it