Campsite a : 82.4
campsite b : 124.5
campsite c : -67.8 morgan is hiking to different points of interest at a national park. she compares the elevation changes recorded by her digital fitness tracker and the elevations stated by the park map. morgan hikes from trail top to a creek marked on the map. her fitness tracker tells her that the change in elevation is −67.2 feet. then she hikes to a swinging bridge. her tracker tells her that the change in elevation for this second hike is 8.4 feet. what was the change in elevation from the beginning of the hike to the end of the hike as recorded on her fitness tracker?
trail top : 381.1
overlook pass : 375.2
cave trail end : -55.3

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.

so mark-up is 0.4 multiplied by 180 = 72