I think it is Z .I hope I helped.
Yes I do know the answer. if you need to find x I found it its below having
Answer: Coal (anthracite) 228.6
Coal (bituminous) 205.7
Coal (lignite) 215.4
Coal (sub-bituminous) 214.3
Diesel fuel and heating oil 161.3
Explanation: Hope this helps!!!
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Answer:
1.) -2 - 1i
2.) -2 - 1i
3.) commutative
Explanation:
Given :
z = 1 + 3i
w = −3 − 4i
1.)
z + w :
1 + 3i + (-3 - 4i)
1 + 3i - 3 - 4i
1 - 3 + 3i - 4i
-2 - 1i
2.)
w + z
-3 - 4i + 1 + 3i
-3 + 1 - 4i + 3i
-2 - 1i
z + w = w + z
Hence, come number addition are commutative