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Rudiy27
2 years ago
10

Please help me asap please and ty

Mathematics
1 answer:
iren2701 [21]2 years ago
6 0

Answer:

(3) k = 2/10

(4) -24

Step-by-step explanation:

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Help me lol !! will give brainleist
katovenus [111]

Answer:

28

Step-by-step explanation:

Since, Sum of triangle is equal to 180°

180 = 2x + 50 + 3x - 10

180 = 5x + 40

180 - 40 = 5x

140 = 5x

140/5 = x

28 = x

3 0
2 years ago
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3 years ago
What is the exact value of cos (67.5° )?
Brilliant_brown [7]

Answer:

0.38268343

Step-by-step explanation:

cos( 67.5 )

Rewrite  

67.5

as an angle where the values of the six trigonometric functions are known divided by  2 . cos ( 135\ 2)

Apply the cosine half-angle identity.

±

√

1

+

cos

(

135

)

2

 

Change the  

±

to  

+

because cosine is positive in the first quadrant.

√

1

+

cos

(

135

)

2

Simplify  

√

1

+

cos

(

135

)

2

√

2

−

√

2

2

The result can be shown in multiple forms.

Exact Form:

√

2

−

√

2

2

Decimal Form:

0.38268343

…

6 0
3 years ago
Which function is the inverse of y = 1/4x^2 - 1, where x < 0
kykrilka [37]

Answer:

B

Step-by-step explanation:

25 x 25= 625

625-1= 624

B= y= -(200 + 1) which to the square root = 625

5 0
2 years ago
Solve for xx. Round to the nearest tenth of a degree, if necessary.
Tanya [424]

Answer:

56.6 °

Step-by-step explanation:

For a RIGHT triangle    cos (x ) = adjacent leg / hypotenuse

                                      cos (x) = 4.4 / 8

                                            arc  cos (4.4/8) = 56.63 °  = ~ 56.6°

8 0
1 year ago
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