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Application problem with a linear function: Finding a coordinate given two points

The monthly cost (in dollars) of water use is a linear function of the amount of water used (in hundreds of cubic feet, HCF). The cost for using 13 HCF of water is  $38.05, and the cost for using 35 HCF is  $67.75. What is the cost for using 19 HCF of water?

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I would like to use SAS to analyze below

  1. Descriptive statistics 2. Bivariate analysis of factors that are significant to Catastrophic Expenditure at 5% (Catas5i) 3. Logistic regression analysis of predictors of Catastrophic Expenditure at 5% (Catas5i) Independent variables: q101: SD/NSD        q103:  public/private facility q104: Secondary/tertiary facility    q110_pat_recode:  Age of patient recoded q111            …