Answer:

And on this case we can use the product rule for a derivate given by:

Where
and
And replacing we have this:

Step-by-step explanation:
We assume that the function of interest is:

And on this case we can use the product rule for a derivate given by:

Where
and
And replacing we have this:

0.34 + x + 1.11 + 0.17 + 0.43 = 2.63
x + 2.05 = 2.63
x + 2.05 (-2.05) = 2.63 (-2.05)
x = 0.58
0.58 in fell in Day 2
hope this helps
Answer:
the answer should be 48cm or 36cm if you need the working it will be my pleasure