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Dmitry_Shevchenko [17]
3 years ago
14

NEED HELP ASAP WILL GIVE BRAINLIEST REAL ANSWERS ONLY PLZ WILL REPORT FAKE ANSWERS

Mathematics
1 answer:
sammy [17]3 years ago
6 0

Answer:

B

Step-by-step explanation:

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If sin(a) = cos(2a), then what is the value of a?
Mariulka [41]

Answer:

-90 , 30

Step-by-step explanation:

sina = cos(2a)

       = 1 - 2(sina)^2

2(sina)^2 + sina -- 1 = 0

( sina + 1 )( 2sina - 1 ) = 0

sina = -1                     or sina = 1/2

=> a = -90 degrees   or => a = 30 degrees

     

3 0
3 years ago
PLEASE HELPPPPPPP ME
OLEGan [10]

Answer:

<h3>12.56</h3>

Step-by-step explanation:

To get the length of the arc, we are going to use the formula for calculating the circumference of a semicircle.

Circumference of a  semi circle = πd/2

Given

Diameter d = 8

π = 3.14

Substitute;

C = 3.14(8)/2

C = 3.14 * 4

C = 12.56

Hence the the length of the arc is 12.56

4 0
3 years ago
a 130 ft long guy wire is attached to the top of a cell phone tower. if the wires attached to the ground at a distance of 50 ft
Iteru [2.4K]
X+50=130

130-50= 80

X=80
6 0
3 years ago
What is the diameter of a circular swimming pool with the radius of 8 feet
galina1969 [7]
Solution: d=2r=2·8=16ft

4 0
3 years ago
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Graph this please due today
vaieri [72.5K]

Answer: see last picture

Step-by-step explanation:

We see that the y-intercept is 10 and the slope is -3

so when x = 0, y = 10

Graph this first point (picture 1)

Since the slope is -3, every time you go one unit to the left, you go down 3 units, so graph this second point (picture 2)

Continue this until you have no more room on the graph (picture 3)

now draw a line through the dots (picture 4)

4 0
4 years ago
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