This one is so easy that your brain refuses to accept it.
It's looking for a harder answer, but can't find it !
You're totally correct, as far you went. x² + 2x does = -1
Now add ' 1 ' to each side: x² + 2x + 1 = 0
Can you factor that quadratic ?
Can you mash it through the quadratic formula ?
Actually, it's the simplest possible perfect square.
x² + 2x + 1 = (x + 1)²
So the solutions of x² + 2x + 1 = 0 are both x = -1 .
Don't say anything.
I know it's embarrassing.
Add 3 to both sides, this gives y + 3 = db
then divide both sides by b, this gives (y + 3)/b = d
So the probability that the next person is costa Rican means 1 is added to the numerator and denominator. this can then be simplified to
3/10
Its the 3rd choice if we have to shade the unwante part
