Hey guys stuck on three questions, can you help out a bit? Thanks!
1 answer:
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Answer:
A
Step-by-step explanation:
For any point (x, y ) on the parabola the focus and directrix are equidistant
Using the distance formula
= | y - 8 |
Squaring both sides gives
(x - 2)² + (y - 4)² = (y - 8)²
(x - 2)² + y² - 8y + 16 = y² - 16y + 64 ( rearrange and simplify )
(x - 2)² = - 8y + 48
8y = - (x - 2)² + 48
y = - (x - 2)² + 6 → A
Answer: 101.69
Step-by-step explanation:
Formula we use to find the z-score :-
(1)
Given :
Daniel's z score : z= 1.67
Let x be the raw score for Daniel's exam grade, then substitute the values of in (1), we get
Hence, the raw score for Daniel's exam grade = 101.69