Answer:
4
Please see the picture attached.
There will be seven spaces between the 1st and the 8th post.
The distance between posts is 20 meters
The distance between the 1st and the 8th post is 20×7 = 140 metres
Factor out the largest perfect square of 32.
( in this example we factored out 16 )
Rewrite
____
/16⋅2
as the product of two radicals.
The square root of 16 is 4.
Divide numerator and denominator by 4.
Approximately 16 or more precisely 15.5.
Answer: 4ab+10b
2.5ab+14b+1.5b-4
4ab+14b-4b
4ab+10b