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2 years ago

AD = DB and AE = EC. BC = 22 and EF = 9. DE = [?]

Mathematics

1 answer:

marta [7]2 years ago

8 0

Answer:

Step-by-step explanation:

DE=BC/2

DE= 22/2

DE=11

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3 years ago

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The scores on a psychology exam were normally distributed with a mean of 60 and a standard deviation of 10 . A failing grade on

tensa zangetsu [6.8K]

Answer:

The cutoff for a failing score was 40,

Approximately 2.3% of the students failed.

Step-by-step explanation:

Given,

Mean, $\mu=60$

Standard deviation, $\sigma=10$

Let x represents the cutoff for a failing score,

Thus, according to the question,

$\frac{x-\mu}{\sigma}=-2$

$\frac{x-60}{10}=-2$

$x-60=-20$

$x=-20+60$

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2 years ago

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3 years ago

Simplify each expression using the laws of exponents. No negative exponents should be in your final answer. (On the image attach

Cloud [144]

Answer:

Answer is given below with explanations.

Step-by-step explanation:

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