Simplify 1/2 (2a+b) - (4a+b)

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

Read the following two statements. then use the law of syllogism to draw a conclusion. if the tv is too loud, then it will give me a headache. if i have a headache, then i will have to rest.

Angela took a general public aptitude test and scored in the 88th percentile for aptitude in accounting. what percentage of the scores were at or below her score?