In the first week of July, a record of 1100 people went to the local swimming pool. In the second week, 105 fewer people went to the pool than in the first week. In the 3rd week, 130 more people went to the pool than in the second week. In the fourth week, 135 fewer people went to the pool than in the third week. What is the percent decrease in the number of people who went to the pool over these four weeks

Suppose there are 10 five and six-year-old attending a birthday party. when a 30 year old mother walks into the room with an infant in her arms, what happens to the mean age in the room? what happens to the standard deviation of ages in the room? a. the mean and standard deviation of both change. b. the meaning will change, but the standard deviation will stay approximately the same. c. i mean will stay approximately the same, but the standard deviation will change. d. the mean and standard deviation will both stay approximately the same.

Find the value of x that will make l ll m

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.