19-20) Josh invests $1,618 in a savings account with a fixed annual interest rate of 7% compounded semi-annually. Write an exponential function to model the situation, then find how long it will take for the account balance to reach
$3,448.79.

Sophia wrote an equation to represent the revenue of a movie theater for one day. she let x represent the number of child tickets sold and y represents the nunver of adult tickets sold. if a child ticket cost $4, an adult ticket cost $6, and the total revenue for the daybwas $420, which equation could sophia use to represent the number of chikd and adult tickets that were sold?