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solong [7]
3 years ago
11

Which of the expressions (on the photo document I inserted) together represent all solutions to the following equation?

Mathematics
1 answer:
Ipatiy [6.2K]3 years ago
7 0

Answer:

x =15 + 30n

Step-by-step explanation:

8cos(12x)+4=-4

Subtract 4 from each side

8cos(12x)+4-4=-4-4

8cos(12x)=-8

Divide by 8

8/8cos(12x)=-8/8

cos(12x) = -1

Take the arccos on each side

arccos(cos(12x)) = arccos(-1)

12x = 180 degrees  

But we can go around in a circle of 360 and get the same result

12 x = 180+360n  where n is an integer

Divide each side by 12

x = 180/12 +360n/12

x =15 + 30n

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A car travelled a distance of D =320 kilometers for T =5.0 hours at a constant rate use the formula D =R. T To find the speed (R
motikmotik

The speed of car is 64 kilometer per hour

<em><u>Solution:</u></em>

Given that car travelled a distance of D = 320 km for T = 5.0 hours

To find: speed (R) of the car in km per hour

<em><u>Formula given:</u></em>

D = R. T

where "D" is the distance

"R" is the speed of car

"T" is the time taken

<em><u>Substituting the given values in above formula we get,</u></em>

320 = R \times 5.0\\\\R = \frac{320}{5}\\\\R = 64

Thus the speed of car is 64 kilometer per hour

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3 years ago
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Delvig [45]

Answer:

x=7

Step-by-step explanation:You can plug in the value for x and solve to see if true.

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3 years ago
3/4 x 21 show your work
Mashcka [7]
3/4 x 21 would be 15.75.
All you had to do was multiply 3/4 and 21.
Hope this helps.
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3 years ago
Find the area of the following shape, you must show all work to recieve credit,
svp [43]
What is the shape for your problem?


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3 years ago
Based on the Nielsen ratings, the local CBS affiliate claims its 10 p.m. newscast reaches 41% of the viewing audience in the are
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Answer:

H0:p=0.41

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Null hypothesis:H0: p=0.41.

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