m(t₂)−m(t₁)=15(t₂ − t₁ )

A chemist dissolves sodium acetate in boiling water. As the temperature cools down, the crystals start to grow with increasing mass m(t), in grams (g) t seconds (s) after crystallization. The equation above shows this relationship where t₁ < t₂. Which of the following correctly explains the growth of the crystal mass?

The crystal mass grows linearly by 15g per s

The crystal mass grows exponentially by 1g every 15s

The crystal mass grows linearly by a factor 15 every s