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3 years ago

What do the a in the equation y= ax2 + bx + c tell you about the parabola? (75 points)

Mathematics

2 answers:

ELEN [110]3 years ago

7 0

The EASIEST way to do it, is actually start with the form a(x-b)(x-c) or intercept form since you have intercepts

x ints at (0,0) and (4,0) so y=ax(x-4)

sub in (2,-4) it doesn't really matter whether or not its a vertex

-4=2a(2-4)

a=1

so y=x(x-4)

expand to get y=x^2-4x which is y=ax^2+bx+c form where a=1, b=-4, c=0

scoundrel [369]3 years ago

6 0

Answer:

Step-by-step explanation:

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Una bañera en forma de trapecio tiene un area de 60 metro ademas se sabe que su base mayor es 3/2 mas grande que su base menor c

valkas [14]

Respuesta:

3,2 metros

Explicación paso a paso:

Área del trapecio:

A = 1/2 (a + b) h

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La altura se puede calcular así;

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2 years ago

Please Help! Thanks!

svetlana [45]

Answer:

C, 20 units

Step-by-step explanation:

We see that both angles QRS and QTR are 90 degrees. In addition, angles SQR and RQT are equivalent (because they're both angle Q).

By AA Similarity, we know that triangle QTR is similar to triangle QRS.

With this similarity in mind, we can look at the ratios of corresponding lengths to set up a proportion. QR from triangle QTR is the hypotenuse, and it corresponds to hypotenuse QS from triangle QRS. So, we can write the ratio x/(9 + 16) = x/25.

Now, we see that long leg QT of triangle QTR corresponds to long leg QR of triangle QRS. So, another ratio we can write is: 16/x.

Finally, we set these two ratios equal to each other:

$\frac{x}{25} =\frac{16}{x}$

Cross-multiplying, we get: $x^{2} =16*25=400$ .

Thus, x = $\sqrt{400} =20$ . The answer is C, 20 units.

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