A piece of wood has a mass of 65.8kg. Calculate the density of wood if 98,000cm³ is the amount of space it takes up

Step-by-step explanation:

density =mass/Volume

but Si unit of volume is m3

convert 980000cm3 into m3 by dividing with 1000000= 980000/1000000= 0.098 m3

D= M/V = 65.8/0.098= 671.43 kg/m3

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.