Its 24 kg , first you divide the 40 into 5 which equals 8 each so for each meter you get 8 kgs
so 8 multiplied by 3 is 24kg
Taken that y don't have f(sin, cos)
you aren't looking for fourier solution or midline like in AC voltage calculation and rather bulk median ?
amplitude can be found by derivating and zero points, but it has been years
8418 is standard form but theres:
word form= eight thousand four hundred and eighteen
or
expanded form: 8000+400+10+8