Recent studies indicate that the average surface temperature of earth has been rising steadily. Some scientists have modeled the temperature by the linear function T = 0.01t + 8.40, where T is temperature in °C and t represents years since 1900. (a) What do the slope and T-intercept represent? The slope is  , which means that the average surface temperature of the planet is  ---Select--- increasing decreasing at a rate of  °C per year. The T-intercept is  , which presents the average surface temperature in °C in the year  . (b) Use the equation to predict the planet's average surface temperature (in °C) in 2090.  °C

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