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2 years ago

The circumference of a circle can be found using the c = 2πr. use the formula to solve for the radius of a circle, r

Mathematics

2 answers:

solong [7]2 years ago

8 0

Answer:A) r= C over 2 pie

Step-by-step explanation:

Given: The circumference of a circle can be found using the $C=2\pi r$

To solve the above equation for radius of the circle 'r', first divide $2\pi$ on both sides of the equation, we get

$r=\dfrac{C}{2\pi}$

Hence, the formula to calculate radius 'r' is the circle will be : $r=\dfrac{C}{2\pi}$

julsineya [31]2 years ago

5 0

$\bf \textit{circumference of a circle}\\\\
C=2\pi r~\hspace{12em}\cfrac{C}{2\pi }=r$

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Alex sold 165 raffle tickets, which was about 70% of the number of tickets sold by his brother Zane. Approximately how many tick

Len [333]

Answer:

115.5 tickets sold.

Step-by-step explanation:

Finding the percent of something is the same as multiplying by that percent as a decimal. So, 70% = 0.70.

0.70 x 165 = 115.5 tickets sold.

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2 years ago

Last year there were 120 students in choir. This year, 30% more students took choir. How many students are taking choir this yea

hjlf

Answer:

120 into a third and divide and the answer

Step-by-step explanation:

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2 years ago

Three year ago , Jolene bought $750 worth of stock in a software company. Since then the value of her purchase has been increase

DIA [1.3K]

End of First Year (750/100)x12(3/5)=54 $750+54=804
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2 years ago

What is the output of the function when the input is 0

bearhunter [10]

Answer:

y = -1

Step-by-step explanation:

Any ordinate pair (x, y) represents the input output values of a function to be graphed.

For any input value of x, there will be an output value (y).

If input value for the graph attached is x = 0,

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Therefore, y = -1 will be the answer.

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2 years ago

Previously 5% of mothers smoked more than 21 cigarettes during their pregnancy. An obstetrician believes that the percentage of

mr Goodwill [35]

Answer:

p value = 0.03514

Step-by-step explanation:

Hypotheses would be

$H_0: p = 0.05\\H_a: p$

(left tailed test at 10% level of significance)

Here p stands for the sample proportion of mothers smoked more than 21 cigarettes during their pregnancy.

Sample size =130

persons who smoked = 2

Sample proportion = $\frac{2}{130} \\=0.0154$

Assuming H0 to be true

Std error= $\sqrt{0.05*0.95/130} \\=0.01911$

p difference = -0.0346

Test statistic z=-1.81

p value = 0.03514

Since p is less than 0.10, significance level, we reject H0

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2 years ago