Question

1. a dental assistant (da) calculates the number of ounces (oz) of disinfectant required to clean the dental operatory between patients. he uses 1 3/8 oz of disinfectant for the dental chair, 1/6 oz for the low - speed handpiece, 5/12 oz for the light, and 1/2 oz for the high - speed handpiece, 1/4 oz for the dental cart. what is the total amount of disinfectant used? 18. an intensive care unit nurse graphs the amount of coumadin* given to a stroke patient in a 6 - day period. coumadin® dosage a. how many milligrams (mg) of coumadin did the patient receive in the first 3 days? b. how many mg did the patient receive during the 6 days? c. how many additional mg did the patient receive on the last day compared with the first day dose?

Explanation:

Step1: Identify doses for first 3 - days

For Day 1, dose is $\frac{5}{8}$ mg. For Day 2, dose is $1\frac{1}{4}=\frac{5}{4}$ mg. For Day 3, dose is $2\frac{1}{2}=\frac{5}{2}$ mg.

Step2: Calculate sum for first 3 - days

$\frac{5}{8}+\frac{5}{4}+\frac{5}{2}=\frac{5 + 10+20}{8}=\frac{35}{8}=4\frac{3}{8}$ mg.

Step3: Identify doses for 6 - days

Doses are $\frac{5}{8}, \frac{5}{4},\frac{5}{2},\frac{15}{4},\frac{45}{8},\frac{15}{2}$ mg for Day 1 - 6 respectively.

Step4: Calculate sum for 6 - days

$\frac{5}{8}+\frac{5}{4}+\frac{5}{2}+\frac{15}{4}+\frac{45}{8}+\frac{15}{2}=\frac{5 + 10+20 + 30+45+60}{8}=\frac{170}{8}=\frac{85}{4}=21\frac{1}{4}$ mg.

Step5: Calculate difference between last and first day

Dose on last day is $\frac{15}{2}$ mg and on first day is $\frac{5}{8}$ mg. $\frac{15}{2}-\frac{5}{8}=\frac{60 - 5}{8}=\frac{55}{8}=6\frac{7}{8}$ mg.

Answer:

a. $4\frac{3}{8}$ mg
b. $21\frac{1}{4}$ mg
c. $6\frac{7}{8}$ mg