h ≈ 0.25 cm
Hi there !
d = m/V
V = l×w×h
replace
2.17 = 438/(40×20)×h
2.17 = 438/800×h
2.17×800×h = 438
1736h = 438
h = 438/1736
h ≈ 0,25 cm
Good luck !
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