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asambeis [7]
3 years ago
6

Solve the equation 2 cos x + 1 = 0 , 0 <= x <= 2pi PLEASE HELP! WILL AWARD!

Mathematics
2 answers:
Keith_Richards [23]3 years ago
6 0
It would be pi over 6, 5 pi over 6, and 3 pi over 6.
OleMash [197]3 years ago
3 0
Im not saying its right but I got <span>0,<span><span>2π</span>3</span>,<span><span>4π</span>3</span>,and2π  </span><span><span>f<span>(x)</span></span>=2<span><span>cos2</span>x</span>−<span>cosx</span>−1=0</span>
Solve this quadratic equation for cos x.
Since a + b + c = 0, use shortcut.
One real root is cos x = 1 and the other is <span><span>cosx</span>=<span>ca</span>=−<span>12</span></span>.
Trig table and unit circle -->
a. cos x = 1 --> arc x = 0, and arc <span>x=2π</span>
b. <span><span>cosx</span>=−<span>12</span></span> --> arc <span>x=±<span><span>2π</span>3</span></span>
The arc <span><span>−2π</span>3</span> is co-terminal to the arc: <span><span>4π</span>3</span>
Answers for <span><span>(0,2π)</span>:</span>
<span>0,<span><span>2π</span>3</span>,<span><span>4π</span>3</span>,and2<span>π</span></span>
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Help please i will give 30 points
Nata [24]

Answer:

C. 7h + 50 > 99

Step-by-step explanation:

She earns <u>more</u> than $99, so you know that the sign will be > (more than).

h is the number of hours, so to find how much she earns for working h hours at $7/hour, you multiply h by 7  ---  7h

She also earns an additional $50, which will be +50.

Therefore, the equation is: 7h + 50 > 99

Hope this helps :D

5 0
3 years ago
Find the rate of change of total​ revenue, cost, and profit with respect to time. Assume that​ R(x) and​ C(x) are in dollars. ​R
tresset_1 [31]

Answer:

Step-by-step explanation:

Given the Total revenue R(x) = 2x

Cost C(x) = 0.01x²+0.3x+30 where;

x = 30 and dx/dt = 9units per day.

Rate of change of revenue dR/dt = dR/dx • dx/dt

dR/dt = 2dx/dt

dR/dt = 2(9) = $18

Rate of change of revenue with respect to time is 18dollars/day.

Rate of change of cost dC/dt = dC/dx • dx/dt

dC/dt = (0.02x+0.3)dx/dt

dC/dt at x = 30 and dx/dt = 9 will give;

dC/dt = {0.02(30)+0.3}×9

dC/dt = (0.6+0.3) × 9

dC/dt = 0.9×9

dC/dt = $8.1

Rate of change of cost with respect to time is 8.1dollars/day

Profit = Revenue - Cost

Profit = 18-8.1

Daily Profit = $9.9

4 0
3 years ago
N-6+4=24 solve for n
zubka84 [21]
N= 26
hope this helped !!
8 0
3 years ago
Read 2 more answers
This is due today pls help
umka2103 [35]

Answer: the answer is linear

Step-by-step explanation: (not sure what functions it’s talkin about but it is linear)

6 0
3 years ago
Solve the system of linear equations by graphing.<br><br> y=2x−3<br> y=x+2
Musya8 [376]

Step-by-step explanation:

y=2x−3

y=x+2

y=-3

x=3/2

for the second line

y=2

x=-2

7 0
3 years ago
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