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2 years ago

Which expression results from using the Distributive Property to rewrite -9.1 (−4) − 9.1 (12)?

Mathematics

1 answer:

swat322 years ago

6 0

For this case we have that by definition, distributive property is defined as:

$a (b + c) = ab + ac$

We have the following expression:

$-9.1 (-4) -9.1 (12)$

Taking common factor -9.1 we have:

$-9.1 (-4 + 12)$

Thus, the correct option is option B.

Answer:

Option B

$-9.1 (-4 + 12)$

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Step-by-step explanation:

The point-slope form of the equation of a line is ...

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3 years ago

Find the exact value of tan(x-y) if sin x=8/17 cosy = 3/5

jolli1 [7]

To solve the the question we proceed as follows:

From trigonometric laws

$(cos x)^2+(sin x)^2=1$

$sin (x-y)=sin$ $x$ $sin$ $y-sin$ $y$ $cos$ $x$

$cos (x-y)=cos$ $x$ $cos$ $y+sin$ $x$ $xin$ $y$

si $x=\frac{8}{17}$

$cos$ $x=sqrt(1-(sin x)^2)=sqrt(1-64/289)=sqrt(\frac{225}{289} )=\frac{15}{17}$

$cos$ $y=\frac{3}{5}$

$sin$ $x= sqrt(1- (cos x)^2)= sqrt(1-\frac{9}{25} )=sqrt(\frac{16}{25} )=\frac{4}{5}$

thus

$tan (x-y)=[sin (x-y)]/[cos (x-y)]$

=[sin x cos y-sin y cos x]/[cos x cos y+sin x sin y]

plugging in the values we obtain:

$[8/17 *3/5-4/5*15/7]/[15/17*3/5+8/17*4/5]$

simplifying

$[24/85-60/85]/[45/85+32/85]$

$=-\frac{36}{77}$

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2 years ago