A (litres) 160
140
120
100
The amount of oil A left in a leaky barrel after
t minutes is shown on the graph alongside.
a Find the gradient and A-intercept of the line.
Interpret your answers.
b Find the model connecting A and t.
• How much oil will be left after 15 minutes?
d For what values of t is it reasonable to apply
this model?
60
20
2
4
6 8
t (minutes)

18

step-by-step explanation:

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the answer is b.

step-by-step explanation:

it would rotate about 180 degrees.