I need clear answer for this one

A fan delivers 0.8m3s1 of air at 20C dry-bulb temperature. The diameter of the duct is 0.4m and the total length of the straight duct sections from 1 to 10 is 80m. The fan generates a total pressure of at section is 125Pa at section 1 . The loss coefficients for each right angle bend is 0.1 . The density of the air is 1.2kgm3. Calculate (i) the static pressure and velocity pressure at section 1, (ii) the total frictional pressure loss from 1-10, (iii) the pressure loss in the fittings from 1-10, (iv) the total, static, and velocity pressures at section 10, (v) the static and velocity pressure heads at 1 , (vi) the total mechanical energy loss per unit mass of air from 1 to 10 , and (vii) the rate of mechanical energy loss from 1 to 10