The united states uses 4 × 109 megawatt hours of electricity in a year. mexico uses 2 × 108 megawatt hours in a year. how many times more megawatt hours does the united states use than mexico in a year?

Around 2 megawatt hours or exactly 2.02 megawatt hours.

Step-by-step explanation:

4 * 109 = 436

2 * 108 = 216

436/216 = 2.018

Therefore, the United States would use around 2 megawatt hours or exactly 2.02 megawatt hours more than Mexico in one year.

answer: 2530

hope this

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.