Which of the following sets is well-defined? For sets that are not well-defined, change the description so that they
become well-defined.

All ethnic groups
6. 7 wonders of the world

All part of speech
7. All flower

All teachers
8. All planet

All milk
9. All months of the year

Sense organ
10. All counting numbers less than 12

25% is the answer

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.

no idea

step-by-step explanation: