X= {5, 17, 35, 49, 57} y = {3, 49, 68} find x ∪ y {∅} {49} {3, 5, 17, 35, 49, 57, 68}

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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

What is the greatest number of parts of a circle that can be formed by cutting the circle with 7 straight cuts? (note: the parts do not have to be equal in size)