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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F(x) = x^2 -7x +14, g(x) = 4x -9 <br><br> Find (g ° f)(x)

adelina 88 [10]

Answer:

Set up the composite result function.

g(F(x)) Evaluate g(x2−7x+14)

by substituting in the value of F into g.

g(x2−7x+14)=4(x2−7x+14)−9

Simplify each term.

g(x2−7x+14)=4x2−28x+56−9

Subtract 9 from 56.

g(x2−7x+14)=4x2−28x+47

Step-by-step explanation:

5 0

3 years ago

Please help! I really need it!

amm1812

Answer:

1. x > 4

2. m < 2

3. x > 2

4. x < -6

Step-by-step explanation:

These 4 inequalities will be solved the same way we solve equations. We take variables to one side and numbers to another and use algebra to solve. Each of them are solved shown below:

$4+6x$