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hammer [34]
3 years ago
15

An airplane cruising at 20000 feet drops 2500 feet in alitude. What is the airplanes airplanes new altitude ?

Mathematics
1 answer:
svetoff [14.1K]3 years ago
8 0

the airplane new altitude is 17500

20000-2500=17500

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Plssss help due today
asambeis [7]

160-80 = 80

80/2 = 40


angle BCD = 40 degrees


please mark brainliest

6 0
3 years ago
Find all solutions of the equation: 2cos^2x-cosx=1
Art [367]
If you're using the app, try seeing this answer through your browser:  brainly.com/question/3166243

——————————

Solve the trigonometric equation:

     \mathsf{2\,cos^2\,x-cos\,x=1}\\\\ \mathsf{2\,cos^2\,x-cos\,x-1=0}


Make a substitution:

     \mathsf{cos\,x=t\qquad (-1\le t\le 1)}

and the equation becomes

     \mathsf{2t^2-t-1=0}


Rewrite conveniently  – t  as  + t – 2t,  and then factor the left-hand side by grouping:

      \mathsf{2t^2+t-2t-1=0}\\\\ \mathsf{t\cdot (2t+1)-1\cdot (2t+1)=0}


Factor out  2t + 1:

     \mathsf{(2t+1)\cdot (t-1)=0}\\\\ \begin{array}{rcl} \mathsf{2t+1=0}&~\textsf{ or }~&\mathsf{t-1=0}\\\\ \mathsf{2t=1}&~\textsf{ or }~&\mathsf{t=1}\\\\ \mathsf{t=\dfrac{\,1\,}{2}}&~\textsf{ or }~&\mathsf{t=1} \end{array}


Substitute back for  t = cos x:

     \begin{array}{rcl}\mathsf{cos\,x=\dfrac{\,1\,}{2}}&~\textsf{ or }~&\mathsf{cos\,x=1}\\\\ \mathsf{cos\,x=cos\,60^\circ}&~\textsf{ or }~&\mathsf{cos\,x=cos\,0} \end{array}


Therefore,

     \begin{array}{rcl} \mathsf{x=\pm\,60^\circ+k\cdot 360^\circ}&~\textsf{ or }~&\mathsf{cos\,x=0+k\cdot 360^\circ} \end{array}

where  k  is an integer.


Solution set:   

\mathsf{S=\left\{x\in\mathbb{R}:~~x=-\,60^\circ+k\cdot 360^\circ~~or~~x=60^\circ+k\cdot 360^\circ~~or~~x=k\cdot 360^\circ,~~k\in\mathbb{Z}\right\}}


I hope this helps. =)

3 0
3 years ago
Can someone help me with this math question? First to answer will get Brainliest! :)
svetlana [45]

Answer:

A

Step-by-step explanation:

yiu have to rotate it in order to make that

4 0
2 years ago
Read 2 more answers
two boxes of apples contain a total of 24 apples. if you halve the number of apples in the first box and add 4 apples to the sec
Llana [10]
There was 16 apples in the first box and 8 apples in the second box initially.
8 0
3 years ago
Read 2 more answers
Which expression shows seven more than triple a number?
Illusion [34]
I hope this helps you




A ) 7 less than triple a number



B ) 7 more than triple a number



C ) 3 less than seven time a number



D ) 3 more than seven time a number



answer is B
5 0
3 years ago
Read 2 more answers
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