Nelson has been collecting he has collected 7 whole and 5 over 12 dozen marbles so far how many marbles are in his collection

Alright, lets get started.

1 dozen, means 12

Collecting 1 dozen marbles means 12 marbles.

Nelson has 7 whole dozens means = 7 * 12 = 84

And he has 5/12 dozen that means = 5 / 12 * 12 = 5

So, in total = 84 + 5 = 89

Means Nelson has 89 marbles in his collection. Answer

Hope it will help :)

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.