# Tutor profile: Snehal D.

## Questions

### Subject: Pharmacy

Your patient weighs 140 lbs. He requires 80 units/kg heparin bolus, followed by 18 units/kg/hour infusion. What is the correct bolus dose and infusion rate? a. 11,000 unit bolus; 2,500 units/hr b. 6,000 unit bolus; 2,000 units/hr c. 5,000 unit bolus; 550 units/hr d. 5,000 unit bolus; 1,100 units/hr e. 2,500 unit bolus; 1,100 units/hr

Since our patient is 140lbs we must convert it to kg by dividing it by 2.2 lb/kg. Next we will multiply that value to 80 units/kg and also to 18 units/kg/hour to get our answers: 140/2.2 = 63.6 kg 63.6 kg * 80 units/kg = 5088 units (Bolus dose) 63.6 kg * 18 units/kg/hour = 1144.8 units/hour (Infusion rate) Since we get 5088 units as our bolus dose and 1144.8 units/hour as infusion, this closely matches answer d in this problem.

### Subject: Chemistry

Round the following to the indicated number of significant figures: 0.424 (to two significant figures)

1. To solve this problem, the first step is to understand certain rules on significant figures as listed below: a. All non-zero digits count b. Leading zeros DONOT count c. Zeros between non-zero numbers DO count d. Trailing zeros or zeros at the end of the numbers count only if there is a decimal point 2. Once you have understanding of these 4 rules, we can use it for this problem and find out that our answer will be 0.42.

### Subject: Algebra

Solve the equation: -5x + 20 = 25

1. To solve this problem, note that x is what we are looking for. 2. Since our ultimate goal is to figure out what x is we must keep it on one side. 3. To move it to one side, subtract 20 on both sides to get rid of 20 on the left. 4. Once you have done step 3, you will get -5x = 5 5. Now you divide by -5 on both sides to get x=-1 6. Finally you can check it by plugging in -1 and you'll get 25=25