exam Maths Puzzle Numerical Ability

Find a relationship between x and f(x)
write equation f(x)= ?

x variables: 0,1,2,3,4,5
f(x)variables: 5,4,3,2,?,?

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exam Other Question

I worked this out sqrt(3x+3)- 9 = 0; I came up with x=2 and checking the problem by plugging 2 in, I came up with 81 not = to 9. Can someone advise please? if one hand equals 4 inches, find the height in feet of a horse that is 16.2 hands`(1 ft= 12 inches)