- Find the perimeter of triangle XYZ with verticals X(-3,-6) Y(21,-6) Z(21,4)?

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Please show me how to calculate my grade example this one 77.66 but if the teacher add 10 points whats the answer? How does the properties of each element in nobel gases change going down the periodic table? Cut a brick? 2/x + 3/y = 7 1/x - 4/y = −2 solve simultaneously? Part A) What is the null hypothesis?