Weighted mean = (8*10+4*20)/(8+4) = 160/12= 40/3 ≈ 13.3
1/2x + 16 = 36
1/2x = 36 - 16
1/2x = 20
x = 20 * 2
x = 40 <== he started with 40
Answer:
x = -6
Step-by-step explanation:
Solve for x over the real numbers:
2 x^2 + 24 x + 72 = 0
Divide both sides by 2:
x^2 + 12 x + 36 = 0
Write the left hand side as a square:
(x + 6)^2 = 0
Take the square root of both sides:
x + 6 = 0
Subtract 6 from both sides:
Answer: x = -6
Answer: 6√7
Step-by-step explanation:
Geometric Mean: Multiply the 2 numbers and take the square root.
6 · 42 = 252
Now take the square root:
√252
Simplify the radical (if needed):
6√7
Your geometric mean is 6√7.
Hope this helps!
