kitt90335
16.04.2020 •
Mathematics
Ships at sea can send messages to one another using a code of flags. Diagrams of some of the flags are shown. How many flags have 4 lines of symmetry? Which are they?
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Ответ:
Answer C : 3x^2+7xy-2y^2
equivalent to the following expression
Combine like terms
2x^2 + x^2 is 3x^2
4xy+3xy is 7xy
-y^2-y^2 is -2y^2
So expression becomes
Answer C is correct