Which number is a perfect square?

1, 4, 9, 16, 25, etc

Step-by-step explanation:

a perfect square is a whole number multiplied by itself. it can be written with the notation ^2

to find a perfect square, simply square or bring to the 2nd power, any whole number

for example 9^2

this means that 9 is multiplied by ITSELF 2 times, it is NOT 9*2

it can also be written as 9*9=81

hope this helps, if anything confuses you feel free to ask ♡

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

step-by-step explanation:

sorry just need the points