Answer:
85 units^2 = Area of Blue Square
and
x = 5 units
Step-by-step explanation:
To do this we use the Pythagorean theorem (a^2 + b^2 = c^2). a and b represent the legs of the triangle whereas c represents the longest side of the triangle, or the hypotenuse.
Since we know the area of a square is the side length multiplied by itself (or the side length squared),
is the side length of the pink square and
is the side length of the green square.
That means a =
and b =
, so...

35 + 50 = c^2
85 = c^2

Now we need to square the square root of 85 to find the area of the blue square.

85 units^2 = Area of Blue Square
To solve the other question we use the same formula again.

x = 5 units
Using a calculator, I arrived to answer C because if you enter it in right you arrive at 39.419, rounding it to 39.42
Then the surveyor should ask how many people do they read books very simple
Answer: The needles were 0.375 inches longer than the ones needed.
Step-by-step explanation:
To find difference between two values, subtract:
0.6875 - 0.3125 = 0.3750, or 0.375
Hope this helps :)