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 a) 80 usd x (0.9668 usd / 1 aud) b) 80 usd x (1.0343 usd / 1 aud) c) 80 usd x (0.9668 aud / 1 usd) d) 80 usd x (1.0343 aud / 1 usd) (a is incorrect)

D) 80 USD x (1.0343 AUD / 1 USD)

Step-by-step explanation:

The conversion rate that we need goes from 1 USD to the number of AUD.  This means we need the first conversion rate, 1 USD = 1.0343 AUD.

Since we have 80 USD, we are going to multiply 80 by our conversion rate, 1.0343; this eliminates choices A and C.

We want to have our units as AUD when we're finished.  This means that when we multiply, AUD must be on the top of the rate we're multiplying by; this means D is our answer.

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