AM-1607

Exponential and logarithmic equations

A Math · Secondary 4 · Medium · Exponential and logarithmic equations

The temperature of soup

S\,^{\circ}\text{C}

t

minutes after serving is modelled by

S = 50(3)^{-t} + 30.

Find the time taken for the soup to cool to

35^{\circ}\text{C}

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