exam Maths Puzzle Numerical Ability

What is the coefficient of 6/x^2 and the variable part?

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exam Other Question

how to slove 2.1x + 45.2 = 3.2 - 8.4x which equation expresses th relationship between x and y for the following coordinates? (-2,4)(-1,2)(0,1)(1,1/2)(2,1/4)

a. y=-1*2^x
b. y=-1*1/2^x
c. y=2^x
d. y=1/2^x