Final answer:
Greyson is supposed to walk approximately 18.94 miles each week.
Step-by-step explanation:
To calculate the number of miles Greyson is supposed to walk each week, we need to first convert the number of steps to feet. Since each step is calculated to be 2 feet, we multiply the number of steps by 2 to get the total distance in feet. So, Greyson is supposed to walk 50,000 steps * 2 feet/step = 100,000 feet per week.
To convert this distance to miles, we divide the total distance in feet by 5,280 (since there are 5,280 feet in a mile). So, the number of miles Greyson is supposed to walk each week is 100,000 feet / 5,280 feet/mile = 18.94 miles.
Rounding to the nearest hundredth, Greyson is supposed to walk approximately 18.94 miles each week.