Answer:

Step-by-step explanation:
We are given the vertices of triangle ABC. We need to find the length of median AD.
Please see the attachment for figure.
D is mid point of BC because median bisect the opposite side of triangle.
Using the formula of mid point. we get coodrinate of D

D is mid point of B(1,5) and C(-3,-1)

AD is median of triangle ABC. Now we find length of median AD using distance formula of two coordinate.

A(5,1) and D(-1,2)


Thus, 
Answer:
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Step-by-step explanation:
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Answer:
Four times a number is equal to eight times a number minus a number.
Step-by-step explanation:
Answer:
57 and 11
Step-by-step explanation:
57+11=68
57-11=46