Which expression can be used to convert 80 US dollars (USD) to Australian dollars (AUD)? 1 USD = 1.0343 AUD 1 AUD = 0.9668 USD 80 U S D times StartFraction 0.9668 U S D Over 1 A U D EndFraction 80 U S D times StartFraction 1.0343 U S D Over 1 A U D EndFraction 80 U S D times StartFraction 0.9668 A U D Over 1 U S D EndFraction 80 U S D times StartFraction 1.0343 A U D Over 1 U S D EndFraction Mark this and return

x+y=90

x=30-y=x

step-by-step explanation:

if you understand you will get the answer

the answer will be the last one

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.