exam Maths Puzzle Numerical Ability

1/a=1/b+1/c for B

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exam Other Question

Which equation best models the data:
x: -2, 0, 2, 4
y: 3.5, 7, 14, 28
a)y=3.5(2)(^x/2)
b)y=3.5(2)^x
c)y=7(2)(^x/2)
d)y=7(2)^x I am really having a hard time trying to figure out this problem... √ -x+7 = x-1