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weeeeeb [17]
3 years ago
5

Does anyone have a brief explanation on how to solve proportions?

Mathematics
2 answers:
denpristay [2]3 years ago
4 0

1) cross-multiplication: \frac{x}{y} = \frac{a}{b} -> xb = ay

2) common denominator: x/y = a/b -> xb/yb = ya/yb

Cross multiplication is the easiest.

agasfer [191]3 years ago
3 0

Answer:

cross mulitply and then divide

Step-by-step explanation:

In your proportion you will have 3 of the 4 numbers such as 3/7=9/x.  Mulitply the nubers that are diagonal (cross) from each other.  Here it is the 7 and 9 so 7x9 = 63.  Then you will divide that answer by the number that you haven't used yet, here that is the 3.   So 63/3=21.  x=21.  Works all the time.

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shtirl [24]

Answer:

f(x) = 20x - 4 \\ substitute \: y \: for \: f(x) \\ y = 20x - 4 \\ interchange \: x \: and \: y \\ x = 20y - 4 \\ swap \: the \: sides \: of \: the \: equation \\ 20y - 4 = x \\ move \: the \: constant \: to \: the \: right \: hand \\ 20y = x + 4  \\ divide \: both \: sides \: by \: 20 \\ y =  \frac{1}{20} x +  \frac{1}{5}  \\ substitute \: f {}^{ - 1} (x) \: for \: y \\ f {}^{ - 1} (x) =  \frac{1}{20} x +  \frac{1}{5}

The domain of the inverse of a relation is the same as the range of the original relation. In other words, the y-values of the relation are the x-values of the inverse.

Thus, domain of f(x): x∈R = range of f¯¹(x)

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3 0
2 years ago
Please find the answer and explain how you found it
Zigmanuir [339]
The answer is D I made a video incase you can’t see the picture well.
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8 0
3 years ago
HELP NEED ANSWER FOR HOMEWORK
Aleks04 [339]

Answer:

596.032

Step-by-step explanation:

The answer is typed wrong.

Using a calculator: 6.4 x 6.7 x 13.9 = 596.032

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5 0
3 years ago
Read 2 more answers
an online sporting goods store charges $12 for a pair of athletic socks. shipping is $2 per order. write an expression that hana
djverab [1.8K]
For one pair of socks you pay $12 plus $2 shipping.

Let's use x as the variable for how many pairs of socks someone might buy.

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6 0
3 years ago
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Hatshy [7]

Answer:

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Step-by-step explanation:

1, 3, 7, 21

(The bolded is one factor and the other that is not bolded is another factor)

1 times 21 is 21

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7 0
3 years ago
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