**Question**

17) The depth of water in a garden pond is 57.8cm.

The depth decreases by 0.3cm per day.

a) Assume the depth continues to decrease at the same rate.

After how many days will the depth reach 54.2cm?

The depth decreases by 0.3cm per day.

a) Assume the depth continues to decrease at the same rate.

After how many days will the depth reach 54.2cm?

**[3 marks]**

(b) If the depth of water decreases at a slower rate, what effect will this have on your answer to part (a)?

**[1 mark]**