Answer: The required expression for amount left in her bank after the donation is given by
![Amount\ left=45.71-6x](https://img.qammunity.org/2020/formulas/mathematics/middle-school/xx00varosfsi7qqyvcfrio04q26okgsm7l.png)
Explanation:
Since we have given that
Amount of her saving = $45.71
Number of packs of markers to donate to her school = 6
Let the cost of each pack of markers be 'x'.
So, Amount left in her bank account after the donation is given by
![Amount\ left=45.71-6x](https://img.qammunity.org/2020/formulas/mathematics/middle-school/xx00varosfsi7qqyvcfrio04q26okgsm7l.png)
Hence, the required expression for amount left in her bank after the donation is given by
![45.71-6x](https://img.qammunity.org/2020/formulas/mathematics/middle-school/b2bjzxiad9jsbffzmpbbcdgxmwe7y4huc7.png)