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shayshayyy41
22.09.2019 •
Mathematics
Loft insulation reduces annual heating costs by 20%. after he insulated his loft, curtleys annual heating cost was £520. work out curtleys annual heating cost would have been, if he had not insulated his loft.
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Ответ:
$650
Step-by-step explanation:
Let x represent curtleys original annual heating cost.
We have been given that Loft insulation reduces annual heating costs by 20%.
So the cost after 20% reduction would be 80% of original cost that is
.
We have been given that after he insulated his loft, curtleys annual heating cost was £520. We can represent this information in an equation as:
Therefore, Curtley's annual heat costing would have been $650, if he had not insulated his loft.
Ответ:
The chosen topic is not meant for use with this type of problem. Try the examples below.
x
3
=
2
−
2
x
=
−
8
ln
(
x
)
+
2
=
5
Step-by-step explanation: the answer 5