Ms. troy would like you to make a copy of an outfit that she owns and really likes—a sleeveless dress with a short-sleeve jacket. she has selected a lilac linen fabric that comes in 36-in. width. you make a pattern for the dress and record the following measurements:

jacket back length 15 in.
front skirt length 20 in.
full back length 41 in.
what length of material do you need to purchase for the dress portion of the outfit?
a. 82 in.
b. 41 in.
c. 70 in.
d. 91 in.

im not exactly sure which one it is !

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.