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In 2016 - 2018 the number of visits to 6 poles including general surgery poly, echocardiography, eye poly, internal medicine, ENT poly, poly urology fluctuated from 11.23% to -5.23%. Fluctuations in the number of visits can be caused by several factors, one of which is consumer behavior in health service selection decisions. This study aims to determine the effect of the marketing mix on service selection decisions.This research is an analytic survey research with cross sectional approach. The population in this study were patients in 6 outpatient clinics at Jemursari Islamic Hospital in Surabaya. The number of samples is taken by quota sampling within one month.The results showed that the marketing mix at 6 Polis RSI Jemursari Surabaya with a good category of 77.5% resulted in high service selection decisions. The results of the ordinal regression test show a significance value of 0,000 which means that there is an influence of the marketing mix on the decision of choosing the Jemursari Hospital. Of the seven marketing mix elements that have the lowest influence on service selection decisions are the 47.1% price mix element, while the most influential marketing mix element is the human resource mix element with a percentage of 68.6%.The conclusion in this study is the positive influence of the marketing mix on the decision to choose outpatient services at the Jemursari Hospital in 2019.

Limit of a function is the main of calculus that teached in high school. The concept is the value of a function gets closer or approaches some number. This research focuses on finding the use of the limit function concept in every sectors in our daily, inside and outside the mathematic. This research was conducted to increase motivation to students in studying limit of functions in school  and to become a source of knowledge for others. The research method used is study literature. The result of this reseach is the concept of limit function widely used in various sectors of life. In engineering, the concept of limit is used to calculate the speed and maximum output of a machine. In science, the concept of limit exists in mathematics, physics, and chemistry. In the health sector, the concept of limit is used in the eye checkup and in daily, the concept of limit is used with the expression almost, that something is only close, but does not happen.