exam Maths Puzzle Numerical Ability

Given f(x)=1/3x+1
a. the domain
b. f(1)
c. f(1)-f(2)
d. f(1)-f(2)/3

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exam Other Question

Kim weighs 72 kg and eddie weighs 60 kg . Kime is sitting 2 m from fulcrum of a seesaw . How far from kim should eddie sit to balance the seesaw? I HOPE U CAN HELP ME WITH THIS. WRITE AN EQUATION OF A LINE THAT SATISFIES THE GIVEN CONDITIONS. WRITE THE ANSWER IN SLOPE-INTERCEPT FORM.

THE LINE PASSES THROUGH THE POINTS (2,5) AND (8,-5)