You buy a book for $12 and a CD for $6. You hand a sales cleck a $20. How much change should you get back?

Graph the equationy=x^2 -[tex]y = x^{2} - 2[/tex]

Aculture started with 4,000 bacteria. after 5 hours, it grew to 5,200 bacteria. predict how many bacteria will be present after 19 hours. round your answer to the nearest whole number.

1) prove that 731^3−631^3 is divisible by 100 2) prove that 99^3−74^3 is divisible by 25