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# Recent studies indicate that the average surface temperature of the earth has been rising steadily. Some scientists have modeled the temperature by the linear function T = 0.02t + 8.50, where T is temperature in °C and t represents years since 1900. What do the slope and T-intercept represent?

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$T = 0.02t+8.50$

The slope is 0.02

The slope represents the increase in $T$ when $t$ is increased by 1 unit.

Here $T$ is the average surface temperature of the earth.

And $t$ represents years since 1900.

Therefore, the slope represents the yearly increase in surface temperature of the earth, that is 0.02 $\text{\textdegree}$C

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