Question 2 is this a function? (2,4),(1,1),(0,0),(1,-1),(2,4)
2 answers:
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The area for a rhombus is 
. We have the area and the length of one of the diagonals, so we fill in accordingly: 
. 8x/2 = 4x, so now we have 16=4x. Divide both sides by 4 to get x = 4. It's not longer than 8, but it's the length of the other diagonal, for sure.