Answer:
C
Step-by-step explanation:
The focus and directrix are equidistant from any point (x, y) on the parabola.
Using the distance formula
= | y - 4 |
= | y - 4 |
Square both sides
x² + (y + 4)² = (y - 4)² ← expand parenthesis on both sides
x² + y² + 8y + 16 = y² - 8y + 16
Subtract y² - 8y + 16 from both sides
x² + 16y = 0 ( subtract x² from both sides )
16y = - x² ( divide both sides by 16 )
y = - x², or
f(x) = - x² → C
Answer: 4 servings
Step-by-step explanation: If a serving of juice is 1/8 of the pitcher, we know that a full pitcher is capable of 8 servings, because 8 servings would be 8/8 of the picher, that is, the whole pitcher therefor 8 serivngs: 4 servings
Re-written, I believe the equation is:
(W+23)+5=W+(23+5)
With this, the parenthesis have nothing multiplying into it, so we can drop the parenthesis to get:
W+23+5=W+23+5
Which is the same thing.
So I'd assume it is the Associative property, because you are combining the like terms of 23 and 5.
Hope this helps!