Dans 13 ans, l’âge de Victor aura doublé. Quel est l’âge de Victor ?
Aide : on appelle x l’âge de Victor
1°) Ecrire son âge dans 13 ans à l’aide de x
2°) Ecrire le double de son âge à l’aide de x
3°) Traduire par une égalité que l’âge de Victor dans 13 ans sera le double de son âge actuel
4°) Résoudre l’équation ainsi obtenue

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.

60%

answer: 1+1

step-by-step explanation: 1+1 is at least 2