12.Some people are surprised when comparing the FEV for smokers and non-smokers. However, these two groups should not be directly compared. Look at the two data sets and identify at least one confounding factor that might impact the FEV, aside from smoker status. Briefly explain why this factor needs to be controlled before comparing the two groups

Haruka hiked several kilometers in the morning. she hiked only 66 kilometers in the afternoon, which was 25% less than she had hiked in the morning. how many kilometers did haruka hike in all?

Amira is painting a rectangular banner 2 1/4 yards wide. the banner will have a blue background. amira has enough paint to cover 1 1/2 square yards of the wall. the school colors are blue and yellow, so amira wants to add yellow rectangles on the left and right sides of the blue rectangle. the yellow rectangles will each be 3/4 yards wide and the same height as the blue rectangle. what will be the total area of the two yellow rectangles?

Which of the functions below could have created this graph?