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jek_recluse [69]
3 years ago
8

ASAP I NEED HELP

Mathematics
1 answer:
alexdok [17]3 years ago
7 0

The vertex of this parabola is at (3,-2). When the x-value is 4, the y-value is 3: (4,3) is a point on the parabola. Let's use the standard equation of a parabola in vertex form:

y-k = a(x-h)^2, where (h,k) is the vertex (here (3,-2)) and (x,y): (4,3) is another point on the parabola. Since (3,-2) is the lowest point of the parabola, and (4,3) is thus higher up, we know that the parabola opens up.

Substituting the given info into the equation y-k = a(x-h)^2, we get:

3-[-2] = a(4-3)^2, or 5 = a(1)^2. Thus, a = 5, and the equation of the parabola is

y+2 = 5(x-3)^2 The coefficient of the x^2 term is thus 5.

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Someone please help me with this question asap!
Alexeev081 [22]

Answer:

23.5 in

Step-by-step explanation:

To find the length of HJ in triangle GHJ, create <u>three equations</u> using the given information, then solve simultaneously.

<u>Equation 1</u>

HJ is two inches longer than GH:

⇒ HJ = GH + 2

<u>Equation 2</u>

GJ is 17 inches shorter than the sum of HJ and GH:

⇒ GJ + 17 = HJ + GH

<u>Equation 3</u>

The perimeter of ΔGHJ is 73 inches:

⇒ HJ + GH + GJ = 73

<u>Substitute</u> Equation 1 into <u>Equation 2</u> and isolate GJ:

⇒ GJ + 17 = GH + 2 + GH

⇒ GJ + 17 = 2GH + 2

⇒ GJ = 2GH - 15

<u>Substitute</u> Equation 1 into <u>Equation 3</u> and isolate GJ:

⇒ GH + 2 + GH + GJ = 73

⇒ 2GH + GJ = 71

⇒ GJ = 71 - 2GH

<u>Equate</u> the two equations where GJ is the subject and <u>solve for GH</u>:

⇒ 2GH - 15 = 71 - 2GH

⇒ 4GH = 86

⇒ GH = 21.5

<u>Substitute</u> the found value of GH into <u>Equation 1</u> and solve for HJ:

⇒ HJ = 21.5 + 2

⇒ HJ = 23.5

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2 years ago
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The hypotenuse of a right triangle is 15 inches. One of the legs is 3 inches more than the other. Find the length of the two leg
Crank
Let x = one of the legs.

Then, the other leg = x + 3.

Ed will use the Pythagorean Theorem to find the hypotenuse.

So, let a = x one leg. Let b= x + 3 the other leg. And, let c = 15 the hypotenuse.

The Pythagorean Theorem is:

c^2 = a^2 + b^2, where a and b are the legs and c is the hypotenuse.

We have:

15^2 = x^2 + (x + 3)^2

225 = x^2 + x^2 + 6x + 9

Rearranging:

2x^2 + 6x - 216 = 0

Divide by 2:

x^2 + 3x - 108 = 0

Solve by factoring:

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So, x = 9 and x = -12. (x = -12 is not a valid answer.)

x = 9

x + 3 = 12

Conclusion: The legs of the right triangle are 9 inches and 12 inches.

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