My homework for week two in MyMathLab is ready for grading on decimals and percentages.

Decimals and Percentages: I chose the problems in criminal justice and medical because I am going for my degree in criminal justice and they are in many ways related to on another.

Criminal Justice

Blood alcohol concentration (BAC) level is a number typically expressed in a percentage of the concentration of alcohol within the blood stream. There are many formulas for computing one’s BAC after consumption of alcohol.

1. The Widmark formula was created by Eric P. Widmark in 1932 to help one estimate the BAC that we typically use today (WASHINGTON STATE). According to him the amount of alcohol that a person consumes is a function of the following variables: is N=f (W, r, Ct,”B”, t, z) [1] and he relates them according to the following equation: N = Wr (C_{t} + “B”t)

0.8z

What this formula allows you to do is to take the persons height and weight, factor in the amount of alcohol they have consumed in a specific amount of time and the result of this will be their BAC.

2. A BAC of 0.08% means that there is 0.08 % alcohol left in your system at the time of the calculation. Here in the United States it is the legal limit for driving. If you are pulled over and your results end up anything over 0.08% you are considered to be driving under the influence and can get a ticket and arrested.

Medical

It is important that physicians know how long a medicine will stay in a patient’s body in order to prescribe dosing instructions so that the patient does not overdose. For example, a patient takes a pill that has a dosage of 50 mg. (milligrams) and wakes up the next day with a particular percentage of the medication washed out.

1. For this question I chose 35%. If a patient take a 50 mg pill and 35% of it is washed out that would mean the .35 will be washed out which is converted to a fraction of 7/20.

2. If the patient takes a 50 mg pill and 35% is washed out there is 32.5 mg left in the patients system. To get this answer I subtracted the 35% from the 50 mg. 35% of 50 is 17.5 and if you subtract 17.5 from the 50 you will get 32.5.

3. Explain which conversion (percent, decimal, or fraction) was the easiest to use to make the calculation. For me doing the above was the easiest for me because it is what I am familiar with and I honestly would rather do what I know now and get the right answer rather tat trying to do a methods I am still learning and really mess it up.

[1] *I can’t find the actual symbol they used for the alcohol elimination rate so I am substituting B in its place.