IB skill practice

Model with exponential functions

Use exponential models for growth, decay, and repeated percentage change.

Paper 2 5 marks Difficulty 2

Compound bacteria count

A culture has \(800\) cells and multiplies by \(1.25\) each hour. Find the count after \(3\) hours.

Worked practice: result and interpretation

Calculate the requested result first, then choose the interpretation that follows from it.