You have two coins. added together, they equal 15 cents- but one is not a nickel. how is that possible?

  you have 1 nickel and 1 dime...

Step-by-step explanation:

This is a trick question all right!

but actually... very easy! here, think about it like  this:

you said one is not a nickel Correct? so that would be the dime! and the OTHER coin is the nickel! very tricky, tricky question!

It is possible i am wrong but hope it helped! :)

i think it's ф or x=6,-6

step-by-step explanation:

-x^2=-36

x^2=-36

ф

or

if you mean by : -(x^2)=-36

it'll be: x^2=36

x=6,x=-6

hope it'll ! have a good day!

you for asking!