book Maths Puzzle Numerical Ability

how to graph 3x^2-1=y in quadratic equation?

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book Other Question

I am trying to help my son, and I forgot the rules!!!

75=-5a/3

Thanks!!
mom
An island has no currency; it instead has the following exchange rate:

50 bananas = 20 coconuts
30 coconuts = 12 fish
100 fish = 1 hammock

How many bananas equal 1 hammock?

My work cannot figure this problem out.