Arectangle is 15 cm wide. find the area and the perimeter of the rectangle if its width is 3/5 of the length.

Area=375; Perimeter=80

Step-by-step explanation:

15*5/3=25; 15*25=375; 15*2+25*2=30+50=80

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

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step-by-step explanation:

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