a surveyor uses a steel measuring tape that is exactly 50.000 m long at a temperature of 20°C. what is the length on a hot summer day when the temperature is 35°C? Average coefficient of linear expansion α for steel is 1.2 x 10^-5 K^-1

just took the test its not "d"

1) estimating temperature to the nearest tenth of a degree

2) estimating the mass of the sample to the nearest tenth of a gram

4) the position of the cups of sand and water under the heat lamp

a. carbon dioxide, i took the test and got it right.