In order to find the area of a triangle you have to multiply the base with the height then divide by 2.
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In order to be differentiable everywhere,
must first be continuous everywhere, which means the limits from either side as
must be the same and equal to
. By definition,
, and


so we need to have
.
For
to be differentiable at
, the derivative needs to be continuous at
, i.e.

We then need to have

Then

Answer:
draw a square using only 16 squares representing the area, so 8 by 8 by 8 by 8
1.75
2.15
3.105
4.90
these are the answers