Answer:
x²/9 − (y + 1)²/81 = 1
Step-by-step explanation:
-2y − 82 + 9x² = y²
9x² = y² + 2y + 82
9x² = y² + 2y + 1 + 81
9x² = (y + 1)² + 81
9x² − (y + 1)² = 81
x²/9 − (y + 1)²/81 = 1
Answer:
D
Step-by-step explanation:
to find the value in grams, we just multiply by a 1000
so, 31.8 × 1000 = 31,800 grams
Square both sides:
2s + 8 = s²
0 = s² - 2s - 8
Now factor:
0 = (s-4)(s+2)
s - 4 = 0 OR s + 2 = 0
s = 4 OR s = -2
Since square root cannot be negative, s = -2 is not possible,
so we are left with s = 4
