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2 years ago

6

PLEASE HELP THIS IS DUE IN THIRTY MINUTES

1 answer:

Elena L [17]2 years ago

5 0

Answer:

D

Step-by-step explanation:

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Solve 2csc^2x-2cscx-1=0 <br> for 0° ≤ x ≤ 360°

umka21 [38]

Answer:

Step-by-step explanation:

2 csc²x-2 csc x-1=0

or

$\frac{2}{sin^2x} -\frac{2}{sin x} -1=0\\multiply~by~sin^2x\\2-2sin~x-sin^2x=0\\sin^2x+2sinx-2=0\\sin ~x=\frac{-2 \pm\sqrt{2^2-4*1*(-2)} }{2*1} \\=\frac{-2 \pm\sqrt{4+8} }{2} \\=\frac{-2 \pm\sqrt{4*3} }{2} \\=\frac{-2 \pm2\sqrt{3} }{2} \\=-1\pm\sqrt{3} \\|sin~x| \le ~1\\so~sin~x=-1+\sqrt{3} \\sin~x=\sqrt{3} -1\\x=sin^{-1}(\sqrt{3} -1) \approx 47.06^\circ,180-47.06\\or~x=47.06^\circ,132.94^\circ$

6 0

3 years ago

What is the fourth term in the binomial expansion of (2x – y) 7?

nata0808 [166]

Answer:

$(7C4) (2x)^4 (-y)^{7-4}$

And replacing we got:

$35 (2^4) x^4 (-y)^{-3}$

And then the final term would be:

$-560 x^4 y^3$

Step-by-step explanation:

For this case we have the following expression:

$(2x-y)^7$

And we can use the binomial theorem given by:

$(x+y)^n =\sum_{k=0}^n (nCk) x^k y^{n-k}$

And for this case we want to find the fourth term and using the formula we have:

$(7C4) (2x)^4 (-y)^{7-4}$

And replacing we got:

$35 (2^4) x^4 (-y)^{-3}$

And then the final term would be:

$-560 x^4 y^3$

8 0

3 years ago

You have 1240 acres of land, and each acre is worth $52. How much is your land worth in total?

murzikaleks [220]

If one acre is $52, you would multiply 1240 by 52. Your land in total is worth $64,480.

5 0

3 years ago

Given h(x) = x^ - 2, what is the value of h(-3) ?<br><br> ^ = is exponent 2

ella [17]

Answer:

1/9

Step-by-step explanation:

<u>Given</u>

h(x) = x^ - 2
h(-3) = ?

<u>Substitute x with -3</u>

h(-3) = (-3)^-2 = 3^-2 = 9^-1 = 1/9

3 0

3 years ago

Read 2 more answers

*you get 16 points*PLEASE ANSWER i’m kinda failing so help

sleet_krkn [62]

Answer:

Graph 4

Step-by-step explanation:

Parallel lines have no solution to the system of equation. Graph 4 is a set of parallel lines, so they will never intersect.

3 0

3 years ago