Determine, which is the better value 50 envelope for $2.49or 90 envelopes for$5.50

50 envelopes for $2.49

Step-by-step explanation:

Option 1:

2.49/50 = 0.0498 per envelope

Option 2;

5.50/90 = 0.0611 per envelope

Option 1 is a better deal.

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.

well what did you do it matters what you did : )

step-by-step explanation: