Salt dissolved in water is an example of a mixture, because it can be separated by evaporation. true or false
2 answers:
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Answer:
2 OR4 ; both correct
Explanation:
x^2=7
x^4+y^2=50
x^4=(x^2)^2=(7)^2=49 --> 49+y^2=50
y^2=50-49=1 --> y=± --> y=±1
+1 or -1 both possible --> solve both
+1+w=3 --> w = 3 - 1 = 2
OR
-1+w=3 --> w = 3 + 1 = 4