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Afina-wow [57]
3 years ago
7

Prove:

smiddle" class="latex-formula"> = \frac{c}{d}[/tex], then\frac{a+b}{b} = \frac{c+d}{d}. show work pls :)
Mathematics
1 answer:
Masteriza [31]3 years ago
8 0

Step-by-step explanation:

\dfrac{a}{b} = \dfrac{c}{d}

Add 1 to both sides of the equation:

\dfrac{a}{b} + 1 = \dfrac{c}{d} + 1

Note that

\dfrac{a}{b} + 1 = \dfrac{a + b}{b}

Likewise,

\dfrac{c}{d} + 1 = \dfrac{c + d}{d}

Therefore,

\dfrac{a + b}{b} = \dfrac{c + d}{d}

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Yoo i need help !!! its math and i havent learned it yet
BlackZzzverrR [31]

Answer:

{f}^{ - 1} (x) = 9x + 18

Step-by-step explanation:

f(x) =  \frac{1}{9}x - 2

y = \frac{1}{9} x - 2

x =  \frac{1}{9}y - 2

x + 2 =  \frac{1}{9}y

9x + 18 = y

{f}^{ - 1} (x) = 9x + 18

4 0
3 years ago
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Anybody who is good with word problems and (who has done these before) plz help thx!!! :DD
vovikov84 [41]

1. \frac{x}{15}  = 3

2. 8x = 216

6 0
2 years ago
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4
sdas [7]

Answer:

y = 1/3x + 10/3

Step-by-step explanation:

Slope: 1/3

Point (-4,2)

b = 2 - (1/3)(-4) = 10/3

3 0
3 years ago
If sinA=√3-1/2√2,then prove that cos2A=√3/2 prove that
Ivan

Answer:

\boxed{\sf cos2A =\dfrac{\sqrt3}{2}}

Step-by-step explanation:

Here we are given that the value of sinA is √3-1/2√2 , and we need to prove that the value of cos2A is √3/2 .

<u>Given</u><u> </u><u>:</u><u>-</u>

• \sf\implies sinA =\dfrac{\sqrt3-1}{2\sqrt2}

<u>To</u><u> </u><u>Prove</u><u> </u><u>:</u><u>-</u><u> </u>

•\sf\implies cos2A =\dfrac{\sqrt3}{2}

<u>Proof </u><u>:</u><u>-</u><u> </u>

We know that ,

\sf\implies cos2A = 1 - 2sin^2A

Therefore , here substituting the value of sinA , we have ,

\sf\implies cos2A = 1 - 2\bigg( \dfrac{\sqrt3-1}{2\sqrt2}\bigg)^2

Simplify the whole square ,

\sf\implies cos2A = 1 -2\times \dfrac{ 3 +1-2\sqrt3}{8}

Add the numbers in numerator ,

\sf\implies cos2A =  1-2\times \dfrac{4-2\sqrt3}{8}

Multiply it by 2 ,

\sf\implies cos2A = 1 - \dfrac{ 4-2\sqrt3}{4}

Take out 2 common from the numerator ,

\sf\implies cos2A = 1-\dfrac{2(2-\sqrt3)}{4}

Simplify ,

\sf\implies cos2A =  1 -\dfrac{ 2-\sqrt3}{2}

Subtract the numbers ,

\sf\implies cos2A = \dfrac{ 2-2+\sqrt3}{2}

Simplify,

\sf\implies \boxed{\pink{\sf cos2A =\dfrac{\sqrt3}{2}} }

Hence Proved !

8 0
3 years ago
Mr khan is buys 15 staplers for his office each stapler cost $16.99. What does his final total cos depend upon
ICE Princess25 [194]
The final cost depends on the amount he buys since the 16.99 is the constant. Equation form is 16.99n where n is the amount hence the inconsistent variable
6 0
3 years ago
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