Help!!
A store displays six computers on a shelf side–by–side. Find the total length of the computers on the table if the first computer was eight inches wide and the width of each successive computer is four inches longer than the previous one. Write in Sigma Notation.

Question

ash2326 · Answer

first computer 's length L1=8
second's length L2=8+4=8+4(2-1)
so length of nth computer is Ln=8+4(n-1)
so total length is L
$$\sum_{1}^{8} (8+4(n-1))$$

ash2326 · Answer

sorry i thought there are 8 computers ,
n should be from 1 to 6
$$L=\sum_{1}^{6}(8+4(n-1))$$

anonymous · Answer

Thank you soo much!!