To calculate how many minutes Quinesha exercises in 4 weeks, we first need to determine how many minutes she exercises in one day.
Since she exercises 50 minutes in 2 days, we can find out how much she exercises in 1 day by dividing 50 minutes by 2:
\[ \text{Minutes per day} = \frac{50 \text{ minutes}}{2 \text{ days}} = 25 \text{ minutes/day} \]
Now, we need to find out how many days there are in 4 weeks. Since there are 7 days in a week, we calculate the total days in 4 weeks:
\[ \text{Total days in 4 weeks} = 4 \text{ weeks} \times 7 \text{ days/week} = 28 \text{ days} \]
Next, we multiply the number of minutes she exercises in a day by the total number of days in 4 weeks:
\[ \text{Total minutes in 4 weeks} = 25 \text{ minutes/day} \times 28 \text{ days} = 700 \text{ minutes} \]
Therefore, Quinesha exercises 700 minutes in 4 weeks.