A is wrong
B is also wrong
D is wrong because {-1,1} is not including -1 and 1
-1 <= y <= 1 mean [-1, 1 ] so answer is C
It’s B because a discount takes money off a item
ANSWER
EXPLANATION
Coterminal angles are angles in standard position that have the same terminal side.
To find an angle in standard position that is coterminal with
We add or subtract multiples of
The first addition gives,
We add the second multiple to get,
Since this is the maximum value among the options, we end the addition here.
Let us now subtract the first multiple to get,
We end the subtraction here because this is the least value among the options.
Therefore the angles that are coterminal with
are
well, let's start off by doing some grouping, what we'll be doing is so-called "completing the square" as in a perfect square trinomial, since that's what the vertex form of a quadratic uses.
well, darn, we have a missing number for our perfect trinomial, however let's recall that in a perfect square trinomial the middle term is really the product of 2 times the term on the left and the term on the right without the exponent, so then we know that
well then, that's our mystery guy, now, let's recall all we're doing is borrowing from our very good friend Mr Zero, 0, so if we add 3², we also have to subtract 3².
over 9000 becuz it is over 9000