According to the United States Census Bureau, on September 1, 2014, the population of the United States was increasing by 1 person every 12 seconds. At this rate, by how much would the
population of the United States increase in 1 year?

2,628,000 people per year.

Step-by-step explanation:

1 person every 12 seconds. There are 60 seconds in 1 minute. So, there are 60 / 12 = 5 people every minute.

There are 60 minutes in an hour. 5 * 60 = 300 people per hour.

There are 24 hours in a day. 24 * 300 = 7,200 people per day.

There are 365 days per year. 7,200 * 365 = 2,628,000 people per year.

Hope this helps!

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.