Adriana, henry, malik, and richard each design surveys to determine the most popular way seventh graders purchase music. adriana samples the five friends sitting at her lunch table. henry samples every boy in his homeroom class. malik samples every student using an mp3 player while waiting for the bus. richard samples the first student alphabetically on the class roster from each of 12 classes. which sample is likely to produce the most valid results?
adriana’s sample
henry’s sample
malik’s sample
richard’s sample

Geometry: determine whether segment mn is parallel to segment kl. justify your answer. jm 6 mk 3 jn 8 nl 4

Place the following steps in order to complete the square and solve the quadratic equation,

Ascientist wants to use a model to present the results of his detailed scientific investigation. why would a model be useful? a )because the model makes the concepts easier to understand b) because the model is easy to put together and to use c) because the model prevents other scientists from asking questions d) because the model requires the audience to pay full attention to it i don't know what to choose because between a and d a is much more likely than d because it only wants to get the attention of the audience. i'm confuse.