(I)
firstly , we will find maximum and minimum y-value
we can see that
maximum value is 5
minimum value is -5
so, we can find amplitude

..........Answer
(II)
we know that
wave length is the length of one wave
we can see that from B to F , there is one wave
and we are given it's length as 20cm
so, wavelength is 20cm......Answer
(III)
we know that

we are given
frequency =100hz
wavelength =20cm
now, we can find velocity

............Answer
Hi there!
It should be 4 packages, with some mental math.
4 * 20 = 80
4 * 15 = 60
Remember we still have 20 beads left over now. Add it to 60 and bam! You're done!
Answer:
none of the
Step-by-step explanation: none of them
Oh..! it is
= i(0.4-1)
= 0.6i