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3 years ago

A circle has a diameter of 6 cm. What is its area?

2 answers:

8 0

Hey there, we are going to use two formula's, the first formula is A=πr², and the second formula is d=2r. Now, we can solve for a, A=1/4πd²=1/4*π*6²=28.27433cm², Therefore, the answer is 28.26 cm 2

irinina [24]3 years ago

8 0

Answer:

we are going to use two formula's, the first formula is A=πr², and the second formula is d=2r. Now, we can solve for a, A=1/4πd²=1/4*π*6²=28.27433cm², Therefore, the answer is 28.26 cm 2

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r-ruslan [8.4K]

Answer:

Step-by-step explanation:

$\frac{1}{7^{2} } *9=\frac{1}{49} *9=\frac{9}{49}$

3 0

3 years ago

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A box holds 8 red and 4 blue beads. Three beads are taken from the box and not replaced. Determine: The probability that all thr

zubka84 [21]

Answer: $\dfrac{14}{55}, \dfrac{13}{55}$

Step-by-step explanation:

Given

There are 8 red and 4 blue beads

Three beads were taken from the box

(i)No of ways of choosing three red beads out of 12 beads is $^8C_3$

Total no of ways $^{12}C_3$

Probability is

$P=\dfrac{^8C_3}{^{12}C_3}=\dfrac{8\times 7\times 6}{12\times 11\times 10}=\dfrac{2\times 7}{11\times 5}\\P=\dfrac{14}{55}$

(ii)atleast two beads refers to minimum two beads

There can be two possibilities (2B,1 R), (3B, 0R)

$\Rightarrow P=\dfrac{^4C_2\times ^8C_1}{^{12}C_3}+\dfrac{^4C_3}{^{12}C_3}\\\\\Rightarrow P=\dfrac{6\times 8}{220}+\dfrac{4}{220}=\dfrac{52}{220}\\\\\Rightarrow P=\dfrac{13}{55}$

6 0

3 years ago

Jan is draining her garden pond. The pond had 100 gallons of water, and she can drain it at 0.75

oee [108]

Answer:

120 minutes.

Step-by-step explanation: it says before it only has 10 gallons left. Subtract to get 90 gallons before solving. 90/0.75=120. It will take her 120 minutes to have 10 gallons left after draining 90 gallons.

3 0

3 years ago

66/100 simplest friend

tamaranim1 [39]

Assuming you mean simplified, 66/100=33/50, which can be achieved by dividing both the numerator and denominator by 2.

8 0

3 years ago

What is the y-intercept of this line?

Brilliant_brown [7]

Answer:

$\huge\boxed{5}$

Step-by-step explanation:

This equation is in slope intercept form ( $y=mx+b$ ). This is called slope intercept form for a reason - $m$ is always the slope and $b$ is always the y-intercept.

We can see that the coefficient on the x-term is $-\frac{4}{3}$ and the constant being added to it is 5.

This means 5 is the y-intercept.

Hope this helped!

7 0

4 years ago

Read 2 more answers