<u>Part 1</u>
Using the distance formula,

So, the measure of the longest side is 6 units.
<u>Part 2</u>
Triangle ABD will have vertices A(1,7), B(-2, 2), and D(1,2).
We already know that 
Using the distance formula,

So, ABD is a scalene triangle.
<u>Part 3</u>
From part 2, we know that the length of side AD is 5 units.
A equals 54
im thinking b equals 12 but i could be wrong
a is right though
Answer:
your answer would be B
pls mark brainliest also this might help
Step-by-step explanation:
https://www.westada.org/site/handlers/filedownload.ashx?moduleinstanceid=276048&dataid=294376&FileName=ANSWER%20KEYS%207.G.2.pdf
Any number times 1 is the number itself so 1 times 4/7 is 4/7 and 1 times 4/5 is 4/5
-57 is a whole number, yes (it does not have a decimal or fraction)