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VLD [36.1K]
2 years ago
13

Pls help i’ll literally do anything i just need these questions

Mathematics
1 answer:
Sergio [31]2 years ago
4 0

Answer:

17

Step-by-step explanation:

Set up a ratio and solve

(4x + 12) / 192 = 70 / 168

(4x + 12) * 168 = 192 * 70

672x + 2016 = 13440

672x = 11424

x = 17

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Answer:

d

Step-by-step explanation:

 

5 0
3 years ago
Solve the equation for the variable r/4=18​
poizon [28]

Answer:

r = 72

Step-by-step explanation:

Given that:

r/4=18​

Multiplying both sides by 4

r = 18*4

r = 72

I hope it will help you!

8 0
3 years ago
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What is the third angle of a right triangle if one of the angles measures 42.6
Llana [10]

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112

Step-by-step explanation:

lol not 100% sure

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Solve 15k - 4 = 5k + 16
dolphi86 [110]

Answer:

k = 2

Step-by-step explanation:

Given

15k - 4 = 5k + 16 ( subtract 5k from both sides )

10k - 4 = 16 ( add 4 to both sides )

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3 0
3 years ago
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Write the equation of a hyperbola centered at the origin with x-intercepts +/- 4 and foci of +/-2(sqrt5)
Xelga [282]

Answer:

\frac{x^2}{16}-\frac{b^2}{4}=1

Step-by-step explanation:

A hyperbola is the locus of a point such that its distance from a point to two points (known as foci) is a positive constant.

The standard equation of a hyperbola centered at the origin with transverse on the x axis is given as:

\frac{x^2}{a^2}-\frac{y^2}{b^2}=1

The coordinates of the foci is at (±c, 0), where c² = a² + b²

Given that  a hyperbola centered at the origin with x-intercepts +/- 4 and foci of +/-2√5. Since the x intercept is ±4, this means that at y = 0, x = 4. Substituting in the standard equation:

\frac{x^2}{a^2}-\frac{y^2}{b^2}=1\\\frac{4^2}{a^2}-\frac{0}{b^2} =1\\\frac{4^2}{a^2}=1\\ a^2=16\\a=\sqrt{16}=4\\ a=4

The foci c is at +/-2√5, using c² = a² + b²:

c^2=a^2+b^2\\(2\sqrt{5} )^2=4^2+b^2\\20 = 16 + b^2\\b^2=20-16\\b^2=4\\b=\sqrt{4}=2\\ b=2

Substituting the value of a and b to get the equation of the hyperbola:

\frac{x^2}{a^2}-\frac{y^2}{b^2}=1\\\\\frac{x^2}{16}-\frac{b^2}{4}=1

5 0
3 years ago
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