Sorry to bother but i need on number five .

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

Which number produces a rationale number when multiplied by 1/5

Rob spent 25%, percent more time on his research project than he had planned. he spent an extra h hours on the project. which of the following expressions could represent the number of hours rob actually spent on the project? two answers