How can i derive the phase phase bode plot of 10s/(s+1)(0.1s+1)^2

The diagram shows the positions of the sun, moon and earth during spring tides, when the high tides are at their highest and low tides at their lowest. what is it about these positions that causes these high and low tides?

According to the vsepr theory what is the shape of a molecule that has a central atom valence three other items with no lone pairs of electrons

The volume of helium in a blimp is 6.28 x 10^9 millimeters. the density of helium in the blimp is .1786 kilogram/meter^3. find the mass of the helium in the blimp.