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By how much will a slab of concrete 18 m long contract when the temperature drops from 24 °C to -16 °C? (The coefficient of linear thermal expansion for concrete is 10-5 per degree C.)

Answers are in centimeters.

Formula:

change in length= a* Lo* change in temp

Lo = 1800cm

A = 10-5

change in T = 24- (-16) = 40

I keep coming up with .7 cm

the answer was .5cm

Where did I go wrong? Any help greatly appreciated

Thank you