If Sarah works at the concession stand for 2 hours, she'll earn $15.50, but if she works for 4 hours, shell earn $31.00. Find the rate of change.

At the newest animated movie, for every 9 children, there are 4 adults. there are a total of 39 children and adults at the movie.

Can someone me and plz do the problem

Asmall business produces and sells balls. the fixed costs are $20 and each ball costs $4.32 to produce. each ball sells for $8.32. write the equations for the total cost, c, and the revenue, r, then use the graphing method to determine how many balls must be sold to break even.