If P = 3x2 + xy - 5y? Q = 2x2 - xy + 3y2 and R = -6x2 + 4xy - 7y2?
what is P+Q-R?

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The perimeter of a triangle is 69 cm. the first is 5 cm shorter than the second side. the third side is twice as long the first side. find the length of each side

100 points, hi, i’m not sure what to do here,the data doesn’t seem to be quadratic .? can anyone me, in advance