What is the easiest method to solve this equation?

Mathematics

2 answers:

Gennadij [26K]3 years ago

4 0

Using the quadratic equation would be the easiest

Kryger [21]3 years ago

4 0

Answer: C (Quadratic Formula)

Explanation:

No reason really. No way to factor by using “nice” numbers. Isolating the variable (e.g. completing the square) gives us “complicated” fractions. It therefore can’t be D. The answer is C

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A hardware store receives a shipment of bolts that are supposed to be 12 cm long. The mean is indeed 12 cm, and the standard dev

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Answer: 0.9104

Step-by-step explanation:

Given : A hardware store receives a shipment of bolts that are supposed to be 12 cm long.

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Standard deviation : $\sigma= 0.2\text{ cm}$

Sample size : n=10

Since, they will declare the shipment defective and return it to the manufacturer if the average length of the 100 bolts is less than 11.97 cm or greater than 12.04 cm.

So for the shipment to be satisfactory, the length of the bolts must be between 11.97 cm and 12.04 cm.

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Let X be the random variable that represents the length of randomly picked bolt .

For Z score : $z=\dfrac{x-\mu}{\dfrac{\sigma}{\sqrt{n}}}$