Check which of the following numbers are in proportion,10,20,30,40

Use set buikder notation to represent the following set: {, -2, -1, 0}

The dolphins at the webster are fed 1/2 of a bucket of fish each day the sea otters are fed 1/2 as much fish as the dolphins how many buckets of fish are the sea fed each day? simplify you answer and write it as a proper fraction or as a whole or mixed number

Eden has a part time job. she is paid ? 7.20 an hour the week she worked 18 and a half hours how much is she paid