Answer:
1 1/5 or 6/5
Step-by-step explanation:
So you get 2/5 every 1/2 hour so take the amount you have and times it by 3.
You need to distribute the numerical factors for each term in the parenthesis:
![\dfrac{-1}{5}(5x+20)-\dfrac{1}{4}(4x-28) = \dfrac{-1}{5}\cdot 5x + \dfrac{-1}{5}\cdot 20 + \dfrac{-1}{4} \cdot 4x + \dfrac{-1}{4} \cdot (-28)](https://tex.z-dn.net/?f=%20%5Cdfrac%7B-1%7D%7B5%7D%285x%2B20%29-%5Cdfrac%7B1%7D%7B4%7D%284x-28%29%20%3D%20%5Cdfrac%7B-1%7D%7B5%7D%5Ccdot%205x%20%2B%20%5Cdfrac%7B-1%7D%7B5%7D%5Ccdot%2020%20%2B%20%5Cdfrac%7B-1%7D%7B4%7D%20%5Ccdot%204x%20%2B%20%5Cdfrac%7B-1%7D%7B4%7D%20%5Ccdot%20%28-28%29%20)
This equals
![-x-4-x+7 = -2x+3](https://tex.z-dn.net/?f=%20-x-4-x%2B7%20%3D%20-2x%2B3%20)
Answer:
3.5 km
Step-by-step explanation:
We know that 1000 meters = 1 kilometer
500 meters * 1 kilometer/1000m = 500/1000 kilometer = .5 km
He goes .5 km per day
There are 7 days in 1 week, so multiply by 7
7 * .5 km = 3.5 km