First, convert the infusion time to minutes: \(4 \text{ hours} \times 60 \text{ min/hr} = 240 \text{ minutes}\). Then use the drip rate formula: \(\text{Rate (gtt/min)} = \frac{\text{Volume (mL)} \times \text{Drop Factor (gtt/mL)}}{\text{Time (min)}}\). So, \(\frac{250 \text{ mL} \times 10 \text{ gtt/mL}}{240 \text{ min}} = \frac{2500}{240} = 10.416... \text{ gtt/min}\). Rounding to the nearest whole number gives 10 gtt/min.

The formula for rate is volume divided by time. To get a rate in mL per hour, the time must be in hours. Convert 90 minutes to hours: \(\frac{90 \text{ min}}{60 \text{ min/hr}} = 1.5 \text{ hours}\). Now, calculate the rate: \(\frac{250 \text{ mL}}{1.5 \text{ hr}} = 166.66... \text{ mL/hr}\). Rounding to the nearest whole number gives 167 mL/hr.

To calculate the infusion rate in mL/hr, divide the total volume in mL by the total time in hours. The formula is: \(\text{Rate (mL/hr)} = \frac{\text{Total Volume (mL)}}{\text{Total Time (hr)}}\). In this case, \(\frac{1000 \text{ mL}}{8 \text{ hr}} = 125 \text{ mL/hr}\).

To find the rate in mL/hr, the nurse should divide the total volume to be infused by the total number of hours for the infusion. The calculation is: \(\frac{500 \text{ mL}}{2 \text{ hours}} = 250 \text{ mL/hr}\).

First, calculate the total infusion time in minutes: \(10 \text{ hours} \times 60 \text{ min/hr} = 600 \text{ minutes}\). Next, use the drip rate formula: \(\text{Rate (gtt/min)} = \frac{\text{Volume (mL)} \times \text{Drop Factor (gtt/mL)}}{\text{Time (min)}}\). So, \(\frac{1200 \text{ mL} \times 20 \text{ gtt/mL}}{600 \text{ min}} = \frac{24000}{600} = 40 \text{ gtt/min}\).

Microdrip tubing always has a drop factor of 60 gtt/mL. The formula for drip rate is \(\text{Rate (gtt/min)} = \frac{\text{Volume (mL)} \times \text{Drop Factor (gtt/mL)}}{\text{Time (min)}}\). The time is 1 hour, which is 60 minutes. So, \(\frac{50 \text{ mL} \times 60 \text{ gtt/mL}}{60 \text{ min}} = 50 \text{ gtt/min}\). A useful shortcut for microdrip tubing is that the rate in mL/hr is equal to the rate in gtt/min.

The volume to be infused is 1 L, which is equal to 1,000 mL. The medication (20 mEq of KCl) is dissolved in this volume and does not change the total volume for calculation purposes. To find the rate, divide the total volume by the total time: \(\frac{1000 \text{ mL}}{10 \text{ hours}} = 100 \text{ mL/hr}\).

To calculate the rate in mL/hr for an infusion over minutes, use the formula: \(\text{Rate (mL/hr)} = \frac{\text{Volume (mL)}}{\text{Time (min)}} \times 60 \text{ min/hr}\). So, \(\frac{50 \text{ mL}}{20 \text{ min}} \times 60 \text{ min/hr} = 2.5 \times 60 = 150 \text{ mL/hr}\).

To calculate the remaining infusion time, divide the remaining volume by the infusion rate. The formula is: \(\text{Time (hr)} = \frac{\text{Remaining Volume (mL)}}{\text{Rate (mL/hr)}}\). Using the values: \(\frac{800 \text{ mL}}{150 \text{ mL/hr}} = 5.333... \text{ hours}\). Rounding to the nearest tenth gives 5.3 hours.

To calculate the hourly rate for the infusion pump, divide the total volume by the total time. The formula is \(\text{Rate (mL/hr)} = \frac{\text{Total Volume (mL)}}{\text{Total Time (hr)}}\). In this case, \(\frac{2400 \text{ mL}}{24 \text{ hr}} = 100 \text{ mL/hr}\).