Help Please, first one to answer gets BRAINLIEST!

D . 300

Step-by-step explanation:

First find the volume of the rectangular prism with the dimension .

To find the volume, multiply the length by the width by height.

The length is 1 1/4  turn it into an improper  fraction.

1 1/4 = 5/4

Now multiply the three fractions

* =    

Now notice that the that in the second statement it says the side length of the cube is 1/8. So we need to find the volume of a single cube multiply the length by the with by the height. All sides of a cube are equal so you can just cube the side length to find the volume.

V= s^3

V= (1/8)^2

v = 1/512

Now since we know that the volume of a single cube is 1/512  will will divide the volume of the rectangle by the volume of cubes to find out how many cubes are needed to fill the rectangular prism.

=  38400/128 = 300

In this case 300 unit cubes are needed to fill the rectangular prism.

I'm almost sure 10 times 4