Divide 103.2 tonnes in the ratio 5:3​

Step-by-step explanation:

5 : 3

5 + 3 = 8

103.2 ÷ 8

12.9

12.9 × 3

38.7

12.9 × 5

64.5

hello from mrbilldoesmath!

answer:

a(n) - a(n-1) -3

discussion:

this ones a bit interesting. given a(n) = 5 - 3n consider this:

a(n-1) = 5 - 3(n-1)

          = (5 - 3n) + 3             => but a(n) = 5 - 3n, the first term

          = a(n)   + 3                 => subtract 3 from both sides

a(n-1) -3 = a(n)  

or

a(n) - a(n-1) -3

you,

mrb