Ethan has partially filled the prism with 8 unit cubes.
How many more cubes does he need to fill the prism completely
A:10
B:15
C:19
D:21
Help me please!!!???!

Complete Question

A rectangular prism with length, height, and width of 3.  Ethan has partially filled the prism with 8 unit cubes.  How many more cubes does he need to fill the prism completely?

(C)19

Step-by-step explanation:

The Volume of the Prism = Length X Height X Width

=3 X 3 X 3

=

Volume of the Unit Cube =

Number of cubes that will fit into the prism= Volume of Prism ÷ Volume of the Cube

=27 ÷ 1=27 cubes

Since Ethan has partially filled the prism with 8 unit cubes.

Number of Cubes required to fill the prism = 27-8

=19 Cubes

marco saved more.   he saved $35 more.

step-by-step explanation:

1+2+3+4+5+6+7+8+9+10 = 55

2*10 = 20

55-20 = 35