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patriot [66]
3 years ago
15

Using equivalent ratios to find a whole \/

Mathematics
1 answer:
Shkiper50 [21]3 years ago
5 0

Answer:

C.

Step-by-step explanation:

So there are 20 kids with brown hair and this represents 80% of the class total.

So this means 20=.8n since we don't know the total number of kids.

20=.8n

Divide both sides by .8

25=n

So 25 is the total number of kids.

C. is the answer

You could also setup this equation given that 80% is 80/100:

[tex]\frac{20}{\text{ total }}=\frac{80}{100}

To figure out what that total is there you can divide top and bottom of the fraction on right hand side by 4 which gives you the 20 on top and the 25 on bottom.

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How are the coordinates of the extreme value and the equation from part B in the form y=(x-h)^2-c related.
True [87]

The extreme value of y = (x - h)² - c is the vertex of the equation.

<h3>What are extreme values of a function?</h3>

The extreme values of a function are either the maximum or minimum values of the function.

<h3>The equation of a parabola in vertex form</h3>

The equation of a parabola in vertex form with vertex (h', k) is given by

y = a(x - h')² + k and its extreme values are

  • if a > 0  (h', k) is a minimum point and
  • if a < 0 (h', k) is a maximum point.

Since y = (x - h)² - c is the equation of a parabola in vertex form, comparing with y = a(x - h')² + k,

  • h = h'
  • -c = k and
  • a = 1.

So, the cooordinates of the vertex of y = (x - h)² - c is (h, -c).

Now, since a = 1 > 0, (h, -c) is a minimum point.

So, the extreme value of y = (x - h)² - c is the vertex of the equation.

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4 0
2 years ago
Find the surface area
Nuetrik [128]

Answer:

of what? put pic again can't see it.

Step-by-step explanation:

4 0
3 years ago
Use inverse operations to solve each equation. Explain each step and identify the property used to reach each step.
maks197457 [2]
Hello,


The inverse operation's are easy.

is would be h/3-8=19


Hope this helps
5 0
3 years ago
Read 2 more answers
D'Naisa mixed her favorite shade of orange paint. She had 111 gallon of orange paint and added 222 quarts of yellow paint and 33
natka813 [3]

Answer:

7.5 Quarts

Step-by-step explanation:

D'Naisa mixed the following:

  • 1 gallon of orange paint
  • 2 quarts of yellow paint
  • 3 pints of red paint.

We are to determine in total, the number of quarts of paint that she mixed. this is done by converting each of the volume to quart.

<u>1 gallon of orange paint</u>

  • 1 gallon = 4 Quarts
  • Orange Paint=4 Quarts

<u>3 pints of red paint.</u>

  • 1 pint =0.5 quart
  • 3 Pints =3 X 0.5 Quart
  • =1.5 Quart of red paint

Therefore,

Total Volume of Paint Mixed in quart= Volume of Orange+Yellow+Red

=4+2+1.5

=7.5 Quarts

3 0
3 years ago
Read 2 more answers
A local hospital currently has 184 male patients. If the ratio of male to female patients is 4:3, how many female patients are t
Afina-wow [57]

There are 138 female patients in the hospital.

<h3>Solving word problems involving ratios.</h3>

The solution to the word problem involving ratios in the given problem can be determined as follows.

From the given information:

The total number of people in the hospital = male + female

= 184 + x(unknown)

  • If the ratio of male to female is 4: 3.
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The ratio of males in the hospital is:

\mathbf{184= \dfrac{4}{7} \times x }

\mathbf{184\times 7= 4 x }

x = 322

The number of female patients in the hospital can now be computed as:

\mathbf{=\dfrac{3}{7}\times 322}

= 138 female patients

Check:

The total number of people in the hospital is:

= 184 + 138

= 322 patients

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3 0
1 year ago
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