15 hey can you me out with these?

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

How do i make someone brainliest? (if you answer me, i might be able to make you brainliest! )

1jessica's home town is a mid-sized city experiencing a decline in population. the following graph models the estimated population if the decline continues at the same rate. select the most appropriate unit for the measure of time that the graph represents. a. years b. hours c. days d. weeks