exam Maths Puzzle Numerical Ability

x=2y+z=2
5x=z
y=-2x

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exam Other Question

The Area of a rhombus is 150 sq yd and one diagonal is 3/4 the other. Find the perimeter. Find an exponential function of the form f(x) = ba^x +c with y-intercept 2, horizontal asymptote y= -2, that passes through the point P (1,4)

possible answers:
f(x) = -2(2^x)