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3 years ago

10

A school wants to know how the community feels about a merger with another school. The school surveys the parents of the student

s about the merger. Is this sample likely to be biased or unbiased? biased unbiased

1 answer:

Nostrana [21]3 years ago

4 0

This is biased.
School wants to know about a thing involving a merger.
You ask people involved in the merger; BIASED.
You need to ask people from the entire community to be unbiased.

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Slope: 3/4, y-intercept: -1

Amiraneli [1.4K]

Answer:

y = 3/4 x -1

Step-by-step explanation:

The equation for a line with the slope and the intercept is y = mx+b where m is the slope and b is the y intercept

y = 3/4 x -1

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3 years ago

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4! = 4×3×2×1= 24

in 24 different ways

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3 years ago

Round 248,739 to the nearest hundred

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3 years ago

How do you do equations.

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4 years ago

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A bridge in the shape of an arch connects two cities separated by a river. The two ends of the bridge are located at (–7, –13) a

sdas [7]

Answer:

$y=-\dfrac{13}{49}x^2$

Step-by-step explanation:

The shape of an arch corresponds to a parabola.

the general equation for a parabola is:

$y=ax^2+bx+c$

we're given three coordinates: (-7,-13),(7,-13) and (0,0)

so we can plug these values in the general equation to make 3 separate equations:

(x,y) = (-7,-13)

$-13=a(-7)^2+b(-7)+c$

$49a-7b+c=-13$

(x,y) = (7,-13)

$-13=a(7)^2+b(7)+c$

$49a+7b+c=-13$

(x,y) = (0,0)

$0=a(0)^2+b(7)+c$

$c=0$

so we have three equations. and we can solve them simultaneously to find the values of a,b, and c.

we've already found c = 0, let's use substitute it to other equations.

$49a-7b+c=-13\quad\Rightarrow\quad49a-7b=-13$

$49a+7b+c=-13\quad\Rightarrow\quad49a+7b=-13$

we can solve these two equation using the elimination method, by simply adding the two equations

$\quad\quad49a-7b=-13\\+\quad49a+7b=-13$

------------------------------

$\quad\quad 98a=-26$

$\quad\quad a=-\dfrac{13}{49}$

Now we can plug this value of a in any of the two equations.

$49a-7b=-13$

$49\left(-\dfrac{13}{49}\right)-7b=-13$

$-13-7b=-13$

$-7b=0$

$b=0$

We have the values of a,b, and c. We can plug them in the general equation to find the equation of the arch.

$y=\left(-\dfrac{13}{49}\right)x^2+0x+0$

$y=-\dfrac{13}{49}x^2$

$49y=-13x^2$

This our equation of the arch!

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3 years ago