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3 years ago

A circle has a radius of 13 inches. Which equation can be used to find the diameter of this circle?d=2π(13)

Mathematics

2 answers:

sladkih [1.3K]3 years ago

6 0

Diameter is twice of a radius
d=2r
r=13 inches given

d=2*13

motikmotik3 years ago

6 0

Answer: $d=2(13)$

Step-by-step explanation:

We know that, the diameter of a circle is twice of the radius of the circle.

Therefore, if r is the radius of the circle, then diameter of the circle will be :-

$d=2r$

Given: A circle has a radius of 13 inches.

Therefore, the diameter of the given circle will be :-

$d=2(13)=26\ inches$

Hence, the equation which can be used to find the diameter of this circle is $d=2(13)$

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3 years ago

Read 2 more answers

Plzzzzz help me on this and explain

Galina-37 [17]

The Answers are B and C
Its B because 12 is MORE than twice as much as M. Meaning 140 is larger than 2*m
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7 0

3 years ago

Amy is 9 years older than her brother john. their combined age is 23. write an expression to represent johns age (use x)

dedylja [7]

Let x the age of John
Amy's age = x + 9
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8 0

3 years ago

In 1943, an organization surveyed 1100 adults and asked, "Are you a total abstainer from, or do you on occasion consume, alc

Fynjy0 [20]

Answer:

We conclude that the proportion of adults who totally abstain from alcohol has changed.

Step-by-step explanation:

We are given that in 1943, an organization surveyed 1100 adults and asked, "Are you a total abstainer from, or do you on occasion consume, alcoholic beverages?"

Of the 1100 adults surveyed, 429 indicated that they were total abstainers. In a recent survey, the same question was asked of 1100 adults and 352 in

Let p = proportion of adults who totally abstain from alcohol.

where, p = $\frac{429}{1100}$ = 0.39

So, Null Hypothesis, $H_0$ : p = 39% {means that the proportion of adults who totally abstain from alcohol has not changed}

Alternate Hypothesis, $H_A$ : p $\neq$ 39% {means that the proportion of adults who totally abstain from alcohol has changed}

The test statistics that would be used here One-sample z proportion statistics;

T.S. = $\frac{\hat p-p}{\sqrt{\frac{\hat p(1-\hat p)}{n} } }$ ~ N(0,1)

where, $\hat p$ = sample proportion of adults who totally abstain from alcohol = $\frac{352}{1100}$ = 0.32

n = sample of adults surveyed = 1100

So, test statistics = $\frac{0.32-0.39}{\sqrt{\frac{0.32(1-0.32)}{1100} } }$

= -4.976

The value of z test statistics is -4.976.

Now, at 0.10 significance level the z table gives critical values of -1.645 and 1.645 for two-tailed test.

Since our test statistics doesn't lie within the range of critical values of z, so we have sufficient evidence to reject our null hypothesis as it will fall in the rejection region due to which we reject our null hypothesis.

Therefore, we conclude that the proportion of adults who totally abstain from alcohol has changed.

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