The price of an admission ticket to the county fair is $2.50 for each child and $6 for each adult. Last Friday 2,350 people purchased admission tickets and $8,640 was collected.
What system of linear equations can be used to find the number of adults and the number
of children that purchased tickets to the fair?

PLEASE HELP!!

The function c(n) below relates the number of bushels of apples picked at a pick-your-own orchard to the final cost for the apples. it takes as input the number of bushels of apples picked after paying an entry fee to an orchard and returns as output and returns as output the cost of the apples (in dollars)c(n) = 15n + 30which equation below represents the inverse function n(c), which takes the cost of the apples as input and returns the number of bushels picked as output