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-2=4r+s s=-4r-2 or s=-(4r+2)
d[DeltaDirac(t)]/dt
A 16th is just 2 32's every 2 marks is 1/16, 2 of those is 1/8, 2 of those is 1/4. Divide 1/4 x 4=each is 1/16.
It depends on which square roots. I think some examples will help. I will write S(2) to mean the square root of 2 for this answer. So S(2)+S(2)=2S(2). There is no other way to combine them. However, S(8)+S(2)=S(4x2)+S(2)=2S(2)+S(2)=3S(2) So you can combine. Basically, you combine like terms and whenever possible try to create like terms. If you had S(21)+S(19), they are NOT like terms and there is nothing more you can combine. You are done.