Answer:
51
Step-by-step explanation:
8.5/1
and
x/6
cross multiply
51=x
General equation of a circle with centre (h, k) is given by:

Now, the origin is the centre and radius is 20, so substituting these points in yields:

Answer:
31.73 grams
Step-by-step explanation:
70.83 g - 39.1 g = 31.73 g
Answer: Ellen's house is farther away by 898 feet.
Step-by-step explanation:
Given: The distance between Haley's house and Ellen's house = 1.41 miles
We know that 1 mile = 5,280 feet
Then, 
The distance between Haley's house and Dirk's house = 6,547 feet
Clearly, 6,547<7,444.8
And 
Therefore, Ellen's house is farther away by 898 feet.