its sales week at joann which means all customers are given a 20% discount on all purchases. I also have a coupon for 15% off one item. Im buying three packages of aida cloth that cost $12 each. After the two discounts, how much do i pay?

$27.36

Step-by-step explanation:

If s/he is buying 3, add up 12 3 times

12+12+12=36

$36 without any discount

Now let’s add the coupon, it’s 15% off only one item

Let’s get 12

15% of 12 is __

We need to find the __ (find the blank) to find the coupon

Convert 15% into a decimal

0.15

Multiply 0.15 and 12

0.15 x 12 = 1.8

Subtract 1.8 from 12

12-1.8=10.2

Now add the other 2 items

12+12+10.2=34.2

20% of 34.2 is __

We need to find the __ (find the blank) to find the discount.

Convert 20% into a decimal

0.20

Multiply 0.20 and 34.2

0.20 x 34.2 = 6.84

20% of 34.2 is 6.84

Now subtract 6.84 from 34.2

34.2-6.84=27.36

$27.36 with both discounts

-4

step-by-step explanation:

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.