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Probability: the amount you want/total.

Since there are a total of 400 people, and you want the probability that the person has blood type B, we need to find the total number of people who have blood type B. In the problem it says 120 people have blood type B, so plugging the values into our formula, we have: $\frac{120}{400}=\frac{12}{40}=\boxed{{\frac{3}{10}}}$

I already gave you a hint, here: https://web2.0calc.com/questions/2-questions-triangle-jkl-and-triangle-mno-are-similar

Please don't double post!

Yeah, I know, I'm just giving them information.

y=mx+b

Since m is the slope.       

And, b, which is the y-intercept

In an equation of a line, we have y, x, the slope (any variable) and the y-intercept. 

You generally see the equation like this: y=mx+b.

 Still with me?

Next, to find the slope, you have to subtract $y_1$ from $y_2$ , to get $y_2-y_1$

And, then we have to subtract both x-corrdinates-$x_2-x_1$

So, the formula to find the slope is $\frac{y_2-y_1}{x_2-x_1}$ , where $y_1$ is the first y-coordinate,  $y_2$ is the second y-coordinate, $x_1$ is the first x-coordinate, and $x_2$ is the second x-coordinate.

I know this is a lot of information, question me if you need any help!

1. What do similar triangles mean? Similar Triangles are triangles that have proportionate angles and sides. 

In triangle 1, we have the height as 12cm, and the base as 3.5 cm.

In triangle 2, we have the height as x cm and the base as 14 cm.

So, we need to find an equal proportion between 3.5 cm and 14cm. 

Tell me what you think, our next move should be.

Thanks Gavin and Melody,

Sorry, didn't know about it. I thought you were in a hurry, and left, so that's why I finished the rest of the solution.

From now on, I'll never do it again, therefore people can learn, and become smarter.

Yes, that's correct, Gavin!

Continuing, and solving for x, we get: 4

Going back, and plugging our value of 4 for x, we get:

$y=\frac{3}{4}*4^2-6*4+15=\frac{3}{4}*16-24+15=12-24+15=3$

Now, we have y=3.

Thus, the coordinates are $\boxed{(4,3)}$

Hello, again Ant101!

The formula to find the number of diagonals in a closed polygon is: $\frac{n(n-3)}{2}$ , where n is the number of sides.

Since there are 35 diagonals in the polygon, we can let the above formula equal 35.

So, we have: $\frac{n(n-3)}{2}=35$

Taking 2 to the other side, we have: $n(n-3)=70$

We need to find a value of n that suits this scenario, therefore $\boxed{10}$ sides is our answer!

Check: 10*(10-3)=70, 10*7=70, yep!

We use the associative property of multiplication, which is: x*(y*z)=(x*z)*y.

So, here we have: (pq)r and (qr)p.

It doesn't matter where the brackets are around the numbers, it is still going to yield the same value.

Here's an example: 2,3,4

We have (2*3)*4=(3*4)*2=6*4=12*2

24=24, yay!

Area: length*width

Perimeter= 2l+2w

So, for the area, we have: $3x^2+2x-4*x^2+1=-x^2+2x+1$

And, for the perimeter, we have: $2\left(3x^2+2x-4\right)\cdot \:2\left(x^2+1\right)=4\left(3x^2+2x-4\right)\left(x^2+1\right)$