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# Graphing Equalities and Inequalities, Trends and Forecasting

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These data represent the number of students attending a high school.
Year Number of Students
1985 212
1986 295
1987 352
1988 401
1989 473
1990 519
1991 602
(a) Draw a line graph for the data.
(b)Use the line graph to predict how many students enrolled in 1992.

Part 2:
Solve the following linear inequality graphically.
x+2y<4
x-y<5

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Graphing Equalities and Inequalities, Trends and Forecasting are investigated.

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Draw a line graph
These data represent the number of students attending a high school.
Year ...

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###### Education
• BSc , Wuhan Univ. China
• MA, Shandong Univ.
###### Recent Feedback
• "Your solution, looks excellent. I recognize things from previous chapters. I have seen the standard deviation formula you used to get 5.154. I do understand the Central Limit Theorem needs the sample size (n) to be greater than 30, we have 100. I do understand the sample mean(s) of the population will follow a normal distribution, and that CLT states the sample mean of population is the population (mean), we have 143.74. But when and WHY do we use the standard deviation formula where you got 5.154. WHEN & Why use standard deviation of the sample mean. I don't understand, why don't we simply use the "100" I understand that standard deviation is the square root of variance. I do understand that the variance is the square of the differences of each sample data value minus the mean. But somehow, why not use 100, why use standard deviation of sample mean? Please help explain."
• "excellent work"
• "Thank you so much for all of your help!!! I will be posting another assignment. Please let me know (once posted), if the credits I'm offering is enough or you ! Thanks again!"
• "Thank you"
• "Thank you very much for your valuable time and assistance!"

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