Substance decays at a rate of 0.9%. what is the half life?

Agreeting card company can produce a box of cards for $7.50. if the initial investment by the company was $50,000, how many boxes of cards must be produced before the average cost per box falls to $10.50?

Draw a scaled copy of the circle using a scale factor of 2

Annabelle's homework is 75% it took her three hours how long should she estimate it will take her to complete her homework.