HELP. WILL MARK BRAINLIEST TO THE BEST ANSWER. What is the difference in average temperature between the hottest and coldest month?
The hottest month is 21°C and the Coldest Month is -9°C. (THIS QUESTION IS ABOUT TEMPERATURE BTW) So what is the answer?

30 degrees Celsius

Step-by-step explanation:

Assuming that 21 is the average for the hottest month and -9 is the average for the coldest month, you subtract them to find the difference. 21-(-9)= 30

The difference in mean temperature between the hottest and coldest months in a year is known as the Annual range of temperature. The annual range is defined as the difference between the hottest and coldest months, taking monthly mean temperatures in each case. It is given approximately by the difference between the average of the January maximum and minimum temperatures, and the corresponding average for July (6).

the largest number of the four options is 1.8 x 10-2

you have it in scientific notation.

1.80 x 10-6   = 0.00000180

1.80 x 10-4   = 0.000180 (bigger, or "less small", than the former one)

so

1.8 x 10-2       = 0.0180. as you see. the "less small", or the biggest one of them all.

as you have negative exponent, it means you are dividing 1.8 by 100 (i.e. moving the dot towards left, two times).

if you had positive exponent for the scientific notation, power of tenths, you would be multiplying times 100 (moving the dot towards right) as below:

1.8 x (10)2 = 180

so. if you have negative exponent in scientific notation, move the dot toward left. if it is positive, toward right as many times the exponent tells you.