3 years ago

Will mark brainliest please help

Mathematics

1 answer:

Sergeeva-Olga [200]3 years ago

8 0

Answer:

445

Step-by-step explanation:

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Complete the identity

spin [16.1K]

Answer: $cos(\pi-x)=-cos(x)$

Step-by-step explanation:

We need to apply the following identity:

$cos(A - B) = cos A*cos B + sinA*sin B$

Then, applying this, you know that for $cos(\pi-x)$ :

$cos(\pi-x)=cos(\pi)*cos(x)+sin(\pi)*sin(x)$

We need to remember that:

$cos(\pi)=-1$ and $sin(\pi)=0$

Therefore, we need to substitute these values into $cos(\pi-x)=cos(\pi)*cos(x)+sin(\pi)*sin(x)$ .

Then, you get:

$cos(\pi-x)=(-1)*cos(x)+0*sin(x)$

$cos(\pi-x)=-1cos(x)+0$

$cos(\pi-x)=-cos(x)$

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3 years ago

If x=7 and y=−2, evaluate the following expression:7(2x−3y)

drek231 [11]

Answer:

140

Step-by-step explanation:

7(2x-3y)

7(2*7-3(-2))

7(14+6)

7(20)

140

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3 years ago

the legth of a rectangle is three times its width. if the width is diminished by 1 m and the legth increased by 3 m, the area wi

Svetllana [295]

Let width of rectangle be "x"
L= 3x W=x
if width is diminished by 1 that means new width = (x-1)
similarly the new length would be (3x+3)
hence (x-1)*(3x+3)=72
(3x^2)-3=72
3x^2=75
x^2=25
x= +/- 5
reject -5 as you cant have negative length
hence x=5
so original dimensions of rectangle is
L= 15m W=5m

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3 years ago

A recipe for BBQ sauce calls for 5 tablespoons of ketchup for every 2 tablespoons of brown sugar. The point(1, 2.5) is on the li

Papessa [141]

Answer:

Step-by-step explanation:

I’m so sorry but jones bbq foot massage

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3 years ago

A scatter plot contains a trend line with a slope of -4/5. Does this trend line illustrate a correlation?

lesya [120]

That answer to this is B.

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3 years ago