exam Maths Puzzle Numerical Ability

Suppose you have a lemonade stand, and when you charge $2 per cup of lemonade you sell 120 cups. But when you raise your price to $3 you only sell 60 cups. Write an equation for

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exam Other Question

y=(x-3)(x-5)(x-a). Determine the value of a. can you please help me?
Find functions f and g so that h(x) = (f ∘ g)(x).

h(x)=(square root symbol)59x^2+78

all numbers are under the square root symbol

Thanks in advance