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3 years ago

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Which of the following expressions represents the sum of a number and three is divided by two? 2 ÷ x + 3 2 ÷ (x + 3) (x + 3) ÷ 2

x + 3 ÷ 2
PLS ANSWER ASAP!

2 answers:

zzz [600]3 years ago

5 0

(x + 3) divided by 2

third option

Ede4ka [16]3 years ago

5 0

Answer:

(x + 3) divided by 2

third optionStep-by-step explanation:

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The x- and y-coordinates of the focus of a parabola are (1,3) and the directrix is y=-5 . A second parabola is a translation 1 u

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The equation of the second parabola is $y=\frac{1}{16} \left(x - 2\right)^{2} + 1$

Step-by-step explanation:

We know that the focus of the first parabola is (1,3) and the directrix is y = -5. We also know that the second parabola is a translation 1 unit right and 2 units up of the first parabola.

We can use the focus of the first parabola to find the focus of the second parabola (1+1, 3+2) = (2, 5) and the directrix of the second parabola is moved 2 units up. The equation of the directrix of the second parabola is y = -3.

To find the parabola equation we start by assuming a general point on the parabola (x,y).

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$\sqrt{(x-2)^2+(y-5)^2}$

The distance between (x,y) and the directrix y = -3 is $\sqrt{(y+3)^2}$

On the parabola, these distances are equal:

$\sqrt{\left(y+3\right)^2}=\sqrt{\left(x-2\right)^2+\left(y-5\right)^2}\\\left(\sqrt{\left(y+3\right)^2}\right)^2=\left(\sqrt{\left(x-2\right)^2+\left(y-5\right)^2}\right)^2\\\\\left(y+3\right)^2=\left(x-2\right)^2+\left(y-5\right)^2\\\\\left(y+3\right)^2= x^2-4x+4+y^2-10y+25\\\left(y+3\right)^2=x^2-4x+y^2+29-10y\\\\y^2+6y+9=x^2-4x+y^2+29-10y\\16y=x^2-4x+20\\y=\frac{x^2-4x+20}{16}\\\\y=\frac{1}{16} \left(x - 2\right)^{2} + 1$

The equation of the second parabola is $y=\frac{1}{16} \left(x - 2\right)^{2} + 1$

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