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2 years ago

5

There are eight boys and seven girls in a class. The teacher randomly selects three different students to answer questions. What

is the probability that the first two students are girls followed by a boy?

1 answer:

stepladder [879]2 years ago

6 0

the probability is 7/15

Step-by-step explanation:

because there are 7 girls and 8 boys

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"joins" "together" Brad paints a house in 5 days. When his brother Nick joins him, they can paint a house in 3 days. How long do

Brilliant_brown [7]

Answer:

7.5 days.

Step-by-step explanation:

Let t represent time taken by Nick in days to paint the house alone.

Part of house painted by Nick in 1 day would be $\frac{1}{t}$ .

We have been given that Brad paints a house in 5 days, so part of house painted by Brad in 1 day would be $\frac{1}{5}$ .

We are also told that when Brad's brother Nick joins him, they can paint a house in 3 days. So part of house painted by both Brad and Nick together in 1 day would be $\frac{1}{3}$ .

Now, we will equate sum of work done by both brothers with $\frac{1}{3}$ to solve for t as:

$\frac{1}{t}+\frac{1}{5}=\frac{1}{3}$

$\frac{1}{t}\times 15t+\frac{1}{5}\times 15t=\frac{1}{3}\times 15t$

$15+3t=5t$

$15+3t-3t=5t-3t$

$15=2t$

$2t=15$

$\frac{2t}{2}=\frac{15}{2}$

$t=7.5$

Therefore, it will take 7.5 days for the Nick to paint the house alone.

4 0

3 years ago

1/3 ( − 7/4 k +1) − 10/3 k = − 13/8

maksim [4K]

Answer:

k = $\frac{1}{2}$

Step-by-step explanation:

Can i have Brainllest

5 0

2 years ago

Read 2 more answers

Frank plans to spend no more than $85 on plants for his front garden. He purchases a salvia and three azaleas. The azaleas cost

pochemuha

Answer:

Plz mark brainlest and answer my quisten if you know it! Click on my profile and click on quistens.

Step-by-step explanation:

Your answer should be 63. Hope this helps you!

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3 years ago

Helpppppppppppppppppppp pleaseeeeeeeeeeeeee

e-lub [12.9K]

Answer:

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Step-by-step explanation:

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3 years ago

The perimeter of a rectangle is 48 in. If the length is twice the width, what is the length of the rectangle?

likoan [24]

Step one: We need to find the formula for perimeter. And we can't just say "count all the sides". How can we express it? It's length + length + width + width, right? Let's size that down a little bit. 2*length 2*width. We'll use w to express "width" and 2w to express "length".
2(w)+2(2w)=48.
6w=48.
w=8.
Since length is twice the width, 8*2 is 16. Length=16.

You can check it by substituting the different values for length and width into the equation 2w+2l=perimeter.
2(8)+2(16)=48. Is this true? Yep! So you know you're right.

7 0

3 years ago