Cards numbered 1 through 12 are mixed up and placed in a bag. zeb chooses one of
the cards without looking.
what is the probability that zeb chooses a card with a number 6 or greater?

Step-by-step explanation: There are 12 cards in total, so that's going to be the denominator in the equation. We are looking for how many cards in total are of the number six or greater. There are 7 cards in total that are of the number six or greater, so we will put that as the numerator. Your fraction will be 7/12, since there aren't any numbers for the numerator and denominator to divide into.

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.