Answer:
5 cm
Step-by-step explanation:
The volume of a rectangular solid (prism) is given by the formula
V = L x B x H
where
V = volume
L = length
B = breadth
H = height
Given
V = 280 cm³
L = 8 cm
B = 7 cm
we get
280 = 8 x 7 x H
280 = 56H
56H = 280
H = 280/56
H = 5
Therefore the height of the rectangular block is 5 cm