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There are 15 plates and each plate is either 7 or 12 inches diameter. which systems of equations do you use to find the number of 7 inch plates, x and 12 inch plates, y

Points a, b, and c form a triangle. complete the statements to prove that the sum of the interior angles of triangle abc is 180

In a class, there are 12 girls. if the ratio of boys to girls is 5: 4 how many boys are there in the class