exam Maths Puzzle Numerical Ability

Using coordinate geometry, prove the the diagonals of a rhombus are perpendicular.

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exam Other Question

Consistent linear equations can be(circle all correct answers)
A.inconsistent
B.independant
C.dependant
D.transient
does someone have an answer? im confused on how rto wokr this sequence out
0,14, 52, 126, 248
i have tried n cubed but cannot find the answer?