Desde su casa, Emily viajó cuesta arriba a la ferretería durante 60 minutos a 6 millas por hora (mph). Luego viajó de regreso a su casa por la misma ruta cuesta abajo a una velocidad de 12 mph. ¿Cuál es su velocidad promedio para el recorrido completo de su casa a la ferretería y de regreso?

step-by-step explanation:

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.

let's fu(!

step-by-step explanation: