Answer:
Definitions of alpha, beta and gamma radiation, decay equations and half-life definition and calculations. Fission and fusion definitions and an example.
A = 7n + 2
a₁ = 7*1 + 2 = 9
a₂ = 7*2 + 2 = 16
a₃ = 7*3 + 2 = 23
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a₂₀ = 7*20 + 2 = 142
This is an Arithmetic progression, a = 9, last term = 142
Sum of the 20 terms using: n/2(a + l) where l = last term.
= 20/2(9 + 142)
= 10 * 151
= 1510
Sum of the first 20 terms = 1510
4/8+ 1/3= 1/2+ 1/3= ( 3+2)/6= 5/6
Yes, that is true, you have to simplify -42/-45 to be able to see if they are equivalant.
