What is the expanded form of the expression 3 sigma i^3 i=0

Olivia uses the work below to determine 55% of 720 which explains the error in olivia’s solution

Ascatterplot is produced to compare the size of a school building to the number of students at that school who play an instrument. there are 12 data points, each representing a different school. the points are widely dispersed on the scatterplot without a pattern of grouping. which statement could be true

What is sin 7x/4 ? i need on this urgent trig