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Which paper is this question from?

Saw this question online. Does anyone know which paper this question is from?

The mass, A kg, of algae in a small pond, is modelled by the equation

A = p * q ^ t

where p and q are constants and t is the number of weeks after the mass of algae was first recorded.

Data recorded indicates that there is a linear relationship between r and log_10(A) given by the equation

log_10(A) = 0.03t + 0.5

(a) Use this relationship to find a complete equation for the model in the form

A = p * q ^ t

giving the value of p and the value of q each to 4 significant figures.