Using sigma notation, describe the total length of 7 pictures hung side-by-side. Then find the total length the pictures occupy along the wall if the first picture has a length of 10 inches and the length of each successive picture is 4 inches longer than the previous one. (2 points)

Question

anonymous · Answer

Let:
$$l_n$$
Be the length of the nth picture. Then you have:
$$\sum_{n=1}^{7}l_n=L$$
Where L is the total length.