I answered a question correctly and someone deleted my answer without giving me any explanation. I don't know why someone would do that but its really rude. Like someone is trying to help others and you are deleting their answers. What is this??

This has happened to me more than you can count. Usually it's because ofs policy. If the question or answer is not academically related, or you copied from another source, they'll most likely take it down. But I understand where you're coming from. Sometimes they take it down for no reason! I don't know why they do this, but I am not a big fan of it >:((

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

answer: y=4000x+14000

step-by-step explanation: