Some scientists believe that the average surface temperature of the world has been rising steadily. The average surface temperature can be modeled by T = 0.02t + 15.0

Question

where T is the temperature in °C and t is years since 1950.

What do the slope and T-intercept represent?

The slope represents the increase in the average surface temperature in °C per year, and the T-intercept is the average surface temperature in 1950, or 15°C.

The slope represents the decrease in the average surface temperature in °C per year, and the T-intercept is the average surface temperature in 1950, or 15°C.  

  The slope represents the average surface temperature in °C per year, and the T-intercept is the increase in surface temperature in 1950, or 15°C.

The slope represents the average surface temperature in °C per year, and the T-intercept is the decrease in surface temperature in 1950, or 15°C.

The slope represents the change in the average surface temperature in °C per year, and the T-intercept is the predicted surface temperature in year 2015.

Which is the answer?

Answer 1

The slope represents the increase in the average surface temperature in °C per year, and the T-intercept is the average surface temperature in 1950, or 15°C.