Answer:
the amount of soil needed is
![90 in ^3](https://img.qammunity.org/2021/formulas/mathematics/high-school/185xmqzo53r51kfkricydtucun1xlpjkuv.png)
Explanation:
N/B: the width is 8 in
this problem bothers on the mensuration of solid shapes, rectangular prism
Given data
length l= 15 in
width w= 8 in
height h= 3/4 in
The amount of soil need in the flower box is equivalent to the volume of the box for the given data.
![volume- of- soil= L*W*H\\\volume- of- soil= 15*8*(3/4)\\\volume- of- soil= (360)/(4) \\\volume- of- soil=90 in^3](https://img.qammunity.org/2021/formulas/mathematics/high-school/1h7nm2jn1drrejb6vfr3u74r8pzp1rr0jw.png)