70 En France, la production électrique a été de 545 TWh en 2015.
a. Quelle proportion de cette
production pourrait fournir un
parc éolien offshore produisant
85 MWh par an ?
Donner le résultat sous forme
1 TWh = 109 kWh
d'une fraction irréductible.
b. En supposant que ce parc
1 MWh = 106 kWh
comprend 20 éoliennes, combien d'éoliennes seraient
nécessaires pour couvrir la production électrique
française de 2015 ?
Donner une valeur approchée à l'unité près.
=
=

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.

step-by-step explanation:

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the awnser is visionary