which of the following statements is (are) true for all postitive intergers 1) 7^n-2^n is divisible by 5 2) n^2+2n is divisible by

Question

zzr0ck3r · Answer

I dont understand what they want you to do, if you dont need to prove it, there is no way to show it....unless you want to go through every number in the real numbers, but that might take a while.

anonymous · Answer

tbh i just wrote the questions it gave me and i dont understand either

zzr0ck3r · Answer

what class is this for?

anonymous · Answer

summer school

anonymous · Answer

its an online thingy hah

anonymous · Answer

sub in the 1 into the first equation to see if it is divisible by 5..

zzr0ck3r · Answer

yes but he does not know how to prove things by induction...

anonymous · Answer

since it says all positive integers; then start with 1

anonymous · Answer

it doesnt have to. that is the first step for induction. and the question requires the first step

anonymous · Answer

you dont need to prove by mathematical induction after that

zzr0ck3r · Answer

?, just showing for 1 does not help.?

anonymous · Answer

why not? n=1 if it is divisible by 5 then youre done

anonymous · Answer

wth does divisible mean?

anonymous · Answer

it can be divided by whatever number

anonymous · Answer

sounds like divide

zzr0ck3r · Answer

3^x + 5^x is divisible by 8 when x = 1 but not when x = 2

anonymous · Answer

ohh

zzr0ck3r · Answer

this is not right, lots of things will hold for one number and not another

anonymous · Answer

it says choose which statement. its obv. one statement is wrong

zzr0ck3r · Answer

it says chhose the statement that is true, they could both be true
choose the statement that is true
3>1
2>1

zzr0ck3r · Answer

what is the last one? is divisible by what?

zzr0ck3r · Answer

@Omniscience divisible by means no remainder, like 6 is divisble by 3 but not 5

anonymous · Answer

2

anonymous · Answer

i kinda ran out of time on the quiz lol

zzr0ck3r · Answer

i think the first one is and the second one is for sure not.

zzr0ck3r · Answer

n^2 + 2n when n = 1 is 3

zzr0ck3r · Answer

o sorry man, what sort of math class is this for?

anonymous · Answer

adv algebra

zzr0ck3r · Answer

its a lame question then, you do not have the tools to answer these.

zzr0ck3r · Answer

just because the first 20000000000 numbers might make something true, does not mean that 20000000001 will be true.

anonymous · Answer

naw mani dont have a calculator