book Maths Puzzle Numerical Ability

Hello, I need help on this problem and I would really appreciate it if someone helps me out... The problem is this...

John weighs twice as much as each of his twin brothers. If

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book Other Question

LET F(X) = -3X + 5

f(4)

I do not get how this would be done ?

heather How do you compute the intercepts of a quadratic function? If someone is answering this question, would you please also give an example of how you would compute it? Thanks so very