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taurus [48]
2 years ago
10

12 is 80% of what number ?

Mathematics
2 answers:
spayn [35]2 years ago
6 0

Answer:

  • 15

Step-by-step explanation:

<u>Solve the equation:</u>

  • 12/x = 80/100
  • 12/x = 4/5
  • x = 12*5/4
  • x = 15
Vera_Pavlovna [14]2 years ago
4 0

15

Step-by-step explanation:

12/x= 80/100

cross multiply

80x = 1200

x=15

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UNO [17]

Answer:

axis of symmetry is x=\frac{-9}{2}.

The ordered pair of the vertex is (\frac{-9}{2},\frac{-145}{4}).

Step-by-step explanation:

Your function is a quadratic.

Compare x^2+9x-16 to ax^2+bx+c.

You should see that a=1,b=9,c=-16.

The x-coordinate of the vertex or the axis of symmetry since the axis symmetry goes through the vertex can be found by computing \frac{-b}{2a}.

So here we go!

The axis of symmetry is x=\frac{-9}{2(1)}=\frac{-9}{2}.

When you write your axis of symmetry be sure to write it as an equation.

That is the axis of symmetry is x=\frac{-9}{2}.

Now that was also the x-coordinate of your vertex.  To find the corresponding y-coordinate of the vertex, plug your value for x into

y=x^2+9x-16.

y=(\frac{-9}{2})^2+9(\frac{-9}{2})-16

Put into calculator:

y=\frac{-145}{4} when x=\frac{-9}{2}

The ordered pair of the vertex is (\frac{-9}{2},\frac{-145}{4}).

5 0
3 years ago
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Answer:

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Step-by-step explanation:

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kobusy [5.1K]

Answer:

A. 7π/6.

Step-by-step explanation:

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This angle must be in the third quadrant because the sin and cos are negative.

So the answer is π +π/6 = 7π/6.

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