A project can be completed by 8 workers in 30 days. In order to complete the project sooner, the company plans to hire additional workers. How many total workers are needed to complete the project in 16 days?

15

Step-by-step explanation:

Given

8 Workers can a work in 30 days

i.e. 1 workers can do the same job in

If additional workers is hired to do the same work in 16 days

suppose Now x no of workers do the job so, one worker will do the same job in

No of days require to complete the job by one worker  remains the same (considering all are equally efficient)

So a total of 15 workers is required to do the same job in 16 days

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.

b. is true. hope this . happy