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Which ordered pair (c, d) is a solution to the given system of linear equations- c+2d=13 -9c-4d=-15

Are triangles the congruent? write the congruency statement. what is the congruency that proves they are congruent? what is the perimeter of ∆pqr?

Out of 50 students surveyed, 16 have a dog. based on these results, predict how many of the 280 students in the school have a dog.