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3 years ago

Please help me!! I really need it!! I Could fail the 7th grade

Mathematics

1 answer:

babymother [125]3 years ago

7 0

Answer:

Step-by-step explanation:

Price of one ticket = $4

Price of t tickets = 4t

1) 4t + 72 > 400

t > (400-72)/4

2) 4t + 72 > 400

4t + 72 - 72 > 400 - 72 {subtract 72 from both sides}

4t > 328

4t/4 > 328/4 {divide both sides by 4}

t > 82

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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

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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

A cab service charges $4 plus $1.50 per mile. Kate wants to spend no more

bearhunter [10]

Answer:

Step-by-step explanation:

took the test i got bj : fz wf

3 0

2 years ago

Read 2 more answers

Please help I will give Brainliest

omeli [17]

Answer:

The odd function is written f (x) = (x) and rounds the odd numbers to the nearest integer.

The graph of f (x) = (x) includes the point (17/4), (7/2), (15/6)

Step-by-step explanation:

The odd function seeks to round odd numbers, with fractions of first odd numbers and then even by adding 3 to them.

5 0

2 years ago

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Can someone help me with rounding this problem to the tenth? id appreciate it

mezya [45]

4/13.6 = 0

(X/3)/4 = 24

x^2-(7*x)+12 > 0

(1/2)*x^2 = -7

(1/3)*p^2 = 1/4

My friend did this one let me know if it's right or wrong. <3

4 0

3 years ago

Pls explain how you figured out both questions

Mariana [72]

Answer:

A=0.125

B=0.125

Step-by-step explanation

for both you would divide 0.5 by 4. you would cut 0.125 off of each side, but two sides together would 0.25

6 0

3 years ago