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SVETLANKA909090 [29]
3 years ago
15

Help please ! solve for x and round the answer to the nearest tenth. need it asap , thank you

Mathematics
1 answer:
mafiozo [28]3 years ago
6 0

Answer:

3.6

Step-by-step explanation:

11x=40

X=40/11

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XVerify the identity. (7 points) cos 4u = cos22u - sin22u
Alexandra [31]

Answer:

cos 4u = co^s2 2u - sin^2 2u

Step-by-step explanation:

cos 4u = co^s2 2u - sin^2 2u

Let 4u = 2x

cos 2x = cos^2 x - sin^ 2 x

cos (x+x) = cos^2 x - sin^ 2 x

Using cos(x+y) = cos(x)cos(y) -sin(x)sin(y)

cos(x) cos(x)- sin(x) sin (x)= cos^2 x - sin^ 2 x

cos^2 (x) -sin^2 (x) =cos^2 x - sin^ 2 x

Since this is true

cos 2x = cos^2 x - sin^ 2 x

This is true

Substituting 4u back for 2x

cos 4u = co^s2 2u - sin^2 2u

This is true

5 0
3 years ago
Can somebody help me plz i dont understand
Katyanochek1 [597]

Answer:

B cause it righrhjeueudjss

4 0
3 years ago
Read 2 more answers
No Solutions:<br> 2x+9+3x+x=????
kotegsom [21]
2x+3x+x+9 = ??
5x+x+9 = ??
6x+9= ?? 
6x = -9   ---- subtract 9 on both sides

x = - 3/2  ----- didvide by 6 on both sides, simplify
5 0
3 years ago
Read 2 more answers
O is the centre of the circle. AB is a diameter.
viktelen [127]

Answer:

The value of a is 63° and the value of b is 27°

Step-by-step explanation:

In the given figure

∵ OA, OB, and OC are radii of the circle O

→ The radii of a circle are equal

∴ OA = OB = OC

In Δ AOC

∵ OA = OC

∴ Δ AOC is an isosceles triangle

→ Base angles of the isosceles triangle are equal

∵ ∠OAC and ∠OCA are the base angles of the triangle

∴ m∠OAC = m∠OCA

∵ m∠OAC = a°

∴ m∠OCA = a°

→ The sum of angles in any triangle is 180°

∵ a° + a° + m∠AOC = 180°

∵ m∠AOC = 54°

∴ a° + a° + 54 = 180°

→ Add the like terms

∴ 2a° + 54 = 180°

→ Subtract 54 from both sides

∴ 2a° = 126°

→ Divide both sides by 2

∵ m∠OAC = m∠OCA = 126 ÷ 2

∴ a° = 63

∴ The value of a is 63°

In ΔBOC

∵ OB = OC

∴ Δ BOC is an isosceles triangle

→ Base angles of the isosceles triangle are equal

∵ ∠OBC and ∠OCB are the base angles of the triangle

∴ m∠OBC = m∠OCB

∵ m∠OBC = b°

∴ m∠OCB = b°

∵ ∠AOC is an exterior angle of ΔBOC at the vertex O

→ The measure of the exterior angle equals the sum of the measure

    of the opposite interior angles to this vertex

∵ ∠OBC and ∠OCB are the opposite interior angle of ∠AOC

∴ m∠OBC + m∠OCB = m∠AOC

→ Substitute their measures

∵ b° + b° = 54°

→ Add the like terms

∴ 2b° = 54

→ Divide both sides by 2

∴ b° = 27

∴ The value of b is 27°

3 0
3 years ago
Ellie is numbering her 150 pages scrapbook. how many times will she write the digit 4? ​
Oksi-84 [34.3K]

Answer:

33 ​

Step-by-step explanation:

4,14,24,34,40,41,42,43,44,45,46,47,48,49,54,64,74,84,94,

104,114,124,134,140,141,142,143,144,145,146,147,148,149

3 0
2 years ago
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