a. Write an expression for Sadie’s way of calculating the perimeter. Write
an expression for Eric’s way as well.
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b. Use both of the expressions to nd the perimeter of the playground and
the sandbox
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Playground _______________________________________
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Sandbox _______________________________________
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c. Explain why Sadie and Eric always get the same answer, no matter what
the length and width of the rectangle are.
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MATHEMATICS PERFORMANCE TASKS 15 Christie Wainwright