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3 years ago

8

there are 9 students in a class: 7 boys and 2 girls. if the teacher picks a group of 3. at random, what is the probability. that

everyone in the group is a boy ?

2 answers:

timurjin [86]3 years ago

6 0

There is a 1 out of 3 chance of a full boy group

taurus [48]3 years ago

4 0

9 students in a class: 7 boys and 2 girls. picks a group of 3 at random P(all boys) = 7/9*6/8*5/7

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In the formula 1/3 π r*2 •h, if r is doubled and h is divided by 3, what is the ratio of new value of the formula to the origina

Maru [420]

$\bf \textit{volume of a cone}\\\\ V=\cfrac{\pi r^2 h}{3}~~ \begin{cases} r=radius\\ h=height\\[-0.5em] \hrulefill\\ r=\stackrel{doubled}{2r}\\ h=\stackrel{\textit{divided by 3}}{\frac{h}{3}} \end{cases}\implies V=\cfrac{\pi (2r)^2\left( \frac{h}{3} \right)}{3} \\\\\\ V=\cfrac{\pi (2^2r^2)\left( \frac{h}{3} \right)}{3}\implies V=\cfrac{~~\frac{4\pi r^2 h}{3}~~}{3}\implies V=\cfrac{4\pi r^2 h}{3\cdot 3}\implies \stackrel{\frac{4}{3}\textit{ of the original}}{V=\cfrac{4}{3}\cdot \cfrac{\pi r^2 h}{3}}$

3 0

3 years ago

Put 19/22 into a percentage

erastova [34]

Answer:

19/22 into a percentage is 86.36%

6 0

3 years ago

Read 2 more answers

I really need help with this!!! someone help please

Minchanka [31]

Answer:

156 in squared

Step-by-step explanation:

So the formulas will be stated below

Parallelogram Area= 1/2h(b1+b2)

Square Area= Bh

So first do

(4)(12+6)

(4)(18)

No need to half it bc there's the same shape at the bottom

72+18+30+36

6(3)

3x5(2)

12(3)

5 0

3 years ago

IF YOU GET ANSWR RIGHT YOU GET BRAINLIEST!

ollegr [7]

Answer:

b

Step-by-step explanation:

4 0

3 years ago

What would be the answer to 5/4 + 2/-9? How would you solve that? And if you could, could u leave the steps and then put the ans

Gemiola [76]

Answer: 37/36

Step-by-step explanation: find the lowest common multiples of 4 and -9 and the answer is -36

7 0

3 years ago