exam Maths Puzzle Numerical Ability

Can someone please help me? the problem says solve for i=Prt for t, given that i=$90, P=$500, and r=6%years.

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Solve.

x squared - 6x - 3 = 0 The line 3x+2y=16 is the perpendicular bisector of the segment AB Find coordinates of point B given that a) A=(-1,3) (b) A=(0,3)