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RUDIKE [14]
3 years ago
11

what is the rule for solving proportions? A. The sum of the means is the product of the extremes. B. The product of the means is

equal to the product of the extremes. C. The product of the extremes is twice the product of the means.
Mathematics
1 answer:
Zanzabum3 years ago
8 0
The rule is that :
B. The product of the means is equal to the product of the extremes
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The steps to derive the quadratic formula are shown below:
prohojiy [21]

Answer:

\huge\boxed{\sf Option \ B}

Step-by-step explanation:

<h3>Step 3:</h3>

\displaystyle x^2+\frac{bx}{a} =\frac{-c}{a} --------------------(1)

<h3>The next step will be:</h3>
  • to find the b² for the expression on the left.
<h3>How to find b²:</h3>

Take the expression

\displaystyle x^2 + \frac{bx}{a}

<u>We can also write it as:</u>

\displaystyle (x)^2 + 2(x)(\frac{b}{2a} )

According to the formula a^2+2ab+b^2, the b of this expression is \displaystyle \frac{b}{2a}. So,

b² will be:

\displaystyle =(\frac{b}{2a} )^2\\\\=\frac{b^2}{4a^2}

So, we will add \displaystyle \frac{b^2}{4a^2} to both sides in Eq. (1)

For STEP 4, the equation will become:

\displaystyle x^2+\frac{bx}{a} + \frac{b^2}{4a^2} = \frac{-c}{a} + \frac{b^2}{4a^2}

\rule[225]{225}{2}

7 0
1 year ago
Read 2 more answers
Product A is an 8oz bottle of cough medication that sells for $1.36. Product B is a 16-oz. bottle of cough medication that costs
kolezko [41]

Answer:

8 oz bottle

Step-by-step explanation:

1.36/8 = .17

3.20/16 = .20

7 0
3 years ago
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I dont get this???<br>-3(x - 4) + 2x = -6​
kirill [66]

Answer:

Step-by-step explanation:

-3(x-4) + 2x = -6

-3x + 12 +2x = -6

-x +12 = -6

-x = -6-12

-x = - 18

x = 18

Mark as brainliest pls

4 0
3 years ago
A copy machine makes 253 copies in 5 minutes and 45 seconds. How many copies does it make per minute?
Tomtit [17]

Answer:

Step-by-step explanation:

it makes 253 copies in 5 mins 45 seconds

that is to say, 253 copies in 345 seconds

In 1 minute (60 seconds) it will make X copies.

Lets draft an equation to easily express and simplify the problem.

253 copies = 345 seconds

X copies = 60 seconds

lets cross multiply and solve for X

Theefore:

x * 345 = 254 * 60

345x = 15,240

divide through by 345

x = 15240 / 345

x = 44.17

therefore, the copying machine makes approximately 44 copies per minutes

6 0
3 years ago
A dilation with a scale factor of 15 and centered at the origin is applied to MN¯¯¯¯¯¯¯ with endpoints M(−2, −4) and N(1, 5) .
Nutka1998 [239]
<span>coordinates m' is going to be (-2/5,-4/5)


</span><span>coordinates n' is going to be (1/5,1)

</span>I just took the test i hope this helps!
5 0
3 years ago
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