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3 years ago

Find the given measure

Mathematics

1 answer:

Vanyuwa [196]3 years ago

7 0

Answer:

80°

Step-by-step explanation:

The angle on the circle ∠DBC is half the measure of the arc it intercepts, thus

m CD = 2 × 40° = 80°

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in 1950, the population of a city was about 800,000 people. Over the next 50 year, the population increased to 1.3 million.Find

jasenka [17]

Answer:

62.5% increase

Step-by-step explanation:

First step : find the difference between two numbers, in this case, it's 1300000 - 800000 = 500000.

Second Step: Take the difference, 500000, and divide by the original number: 500000/800000 = 0.625.

Last, multiply the number above by 100: 0.625*100 = 62.5%. You're done! You calculated difference of a number in percent, and the answer is a percentage increase of 62.5%.

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3 years ago

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Which of the following reasons can be used to justify statement #3 in the proof?

mixer [17]

c because it is accuet.

hope it helps

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3 years ago

Regina writes the expression y + 9 · ¼. Which expression is equivalent to the one Regina writes?

Alika [10]

Answer:

Regina writes the expression y +9.3/4

Using The commutative property

a + b = b + a

= 9.3/4 + y

= (9.3/4) + y

Step-by-step explanation:

Regina writes the expression y +9.3/4

Using The commutative property

a + b = b + a

= 9.1/4 + y

= (9.1/4) + y

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2 years ago

I would much appreciate the explanation for number 20 cuz ion’ get it

cestrela7 [59]

Answer:

Which is number 20?

Step-by-step explanation:

Which is number 20?

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3 years ago

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Question Help Suppose that the lifetimes of light bulbs are approximately normally distributed, with a mean of 5656 hours and a

koban [17]

Answer:

a)3.438% of the light bulbs will last more than 6262 hours.

b)11.31% of the light bulbs will last 5252 hours or less.

c) 23.655% of the light bulbs are going to last between 5858 and 6262 hours.

d) 0.12% of the light bulbs will last 4646 hours or less.

Step-by-step explanation:

Normally distributed problems can be solved by the z-score formula:

On a normaly distributed set with mean $\mu$ and standard deviation $\sigma$ , the z-score of a value X is given by:

$Z = \frac{X - \mu}{\sigma}$

After we find the value of Z, we look into the z-score table and find the equivalent p-value of this score. This is the probability that a score will be LOWER than the value of X.

In this problem, we have that:

The lifetimes of light bulbs are approximately normally distributed, with a mean of 5656 hours and a standard deviation of 333.3 hours.

So $\mu = 5656, \sigma = 333.3$

(a) What proportion of light bulbs will last more than 6262 hours?

The pvalue of the z-score of $X = 6262$ is the proportion of light bulbs that will last less than 6262. Subtracting 100% by this value, we find the proportion of light bulbs that will last more than 6262 hours.