Answer:
soil needs to be warmer to 3.1° C
Step-by-step explanation:
soil temperature = 13.9° C
required temperature = 17° C
soil needs to be warmer to = 17 - 13.9 = 3.1° C
The thermometer indicates a temperature of 12.75 ° C and it needs to get to 17 °C
or 4.25 degrees more ....rounded to 4 ° C more
