At the start of 2017, a car was worth £12000
value of car decreased by 30% every year for 3 years
what’s the value of the car at the start of 2017

Im goin to assume there was a typo and believe you meant 2020 because the price of the car at the start of 2017 is 12000.

Step-by-step explanation:

The answer is 1764

30% of 12000 is 3600 so 12000-3600=8400

30% of 8400 is 5880 so 8400-5880=2520

30% of 2520 is 756 so 2520-756=1764

the entire expression should be subtracted from 30. to subtract the quantity, distribute the negative sign, which changes the signs on the terms. so, the –2 changes to positive and gets added to 30 instead of subtracted from it.

hope this ! ^w^