Jorge wants to buy an 8 pack of toothbrushes. The price of the toothbrushes is $ 18.12. Jorge will use a coupon for $3 off. What will the unit rate be per toothbrush after the coupon?

$1.89

Step-by-step explanation:

The unit rate before the coupon would be $2.26, but since Jorge has a $3  off coupon we take $18.12 and subtract $3.00 and we get $15.12. Now we take $15.12 and divided that by 8, resulting in $1.89 for the unit rate.

Hope This Helps!

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.