Just finished the test :D. The answer would be -31 1/3
HOPE THIS HELPS :D
Volume of pyramid = 1/3 * height * area of the base
= 1/3 * volume of the cube
= 6 cm^3
2X-3 = -3/4x -1/4
Add 3 on both sides: 2X = -3/4x + 2.75
Add -3/4x on both sides: 2.75X = 2.75
Divide 2.75 on both sides: x= 1
hope this helped