What is the nominal rate of interest compounded continuously for 8 years if the present worth factor is equal to 0.6187835?

A 70 kg bungee jumper jump from the top of a 70 m high bridge and able to touch the water below. The bungee cord has a spring constant of 72.5 N/m, where the unstretched position is when s = 0. Using the principle of work and energy, determine the bungee cord's relaxed length, l, for this jump. If the resistance of the air were not present during the jumping, describe what happened to him?

Using oxyacetylene welding method to weld a 3 ft. long seam in a 3/8 in. thick plate at a consumption rate of 9 cu. ft. /ft. of weld for oxygen and 7 cu. ft./ft. for acetylene. What is the total combined gas consumption in cu. ft.?