Advanced Math

Help me solve this problems.Thanks. :)
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Help me solve this problems.Thanks. :)

Can anyone tell where does -2/5 came from? pleaaaaase
Hello all guys ! Can somebody please explain me how to solve this problem,i got exam which is coming closer and closer with every single day.Probably the problem will be easy for you,but I am new to this science (3-th semester in uni,and this things are new to me)So here is the task,from the exam.
Who has reviewers here for ECE board exam?
Is there a limit of value of modular ratio? If there is, what is the limit?
A motorboat maintained a
constant speed of 15 miles per hour relative to the water in
going 10 miles upstream and then returning. The total time
for the trip was 1.5 hours. Use this information to find the
speed of the current.
Ans: 5 mi/hr.
Any solution for this? Thanks
A structural steel column with Fy = 250 MPa
having an unbraced length of 3m is to carry a total axial load of 1800 kN. Which of the following sections is most economical (lightest ) for the given loads. The comumn is hinged at both ends.
Section A: Area = 13,800mm2 Ix= 293.63 x106mm4Iy= 67.59 x 106mm4
SectionB: Area = 11,550 mm2 Ix=177.04 x 106mm4Iy=39.14x 106mm4
This is for Inverse Laplace Transform.
What will the Region of Convergence (Pole-zero plot) look like if the pole is equal to zero? The zeroes or the numerator has values but the poles or the denominator is just s.

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