Atraeus is solving the quadratic equation by completing the square.

Mathematics

2 answers:

LuckyWell [14K]2 years ago

8 0

I think the value of a I think the answer is b

e-lub [12.9K]2 years ago

5 0

Answer:

A = 7

Step-by-step explanation:

7x² - 14x + 6 = 0 ( subtract 6 from both sides )

7x² - 14x = - 6 ← factor out 7 from each term on the left side

7(x² - 2x) = - 6

then A = 7

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The lifetimes of 10,000 watch batteries are normally distributed the mean lifetime is 500 days the standard deviation is 60 days

Lelu [443]

Given:
μ = 500 days, the population mean
σ = 60 days, the population standard deviation

Therefore
μ + σ = 560
μ - σ = 440
μ + 2σ = 620
μ - 2σ = 380
μ + 3σ = 680
μ - 3σ = 320

The figure shown below illustrates the normal distribution
About 68% of the total area lies in x = (μ-σ, μ+σ)
About 95% of the total area lies in x = (μ-2σ, μ+2σ)
About 99.7% of the total area lies in x = (μ-3σ, μ+3σ).