What's y'all fav song ? :))

50 points please give step by step instruction

fenix001 [56]

Answer:

 x = 90, 199.5, 270, 340.5 degrees

Step-by-step explanation:

cos2x + 2sinx = sin^2x

Change cos2x to 1 - 2sin^2x:

1 - 2sin^2x + 2 sinx = sin^2x

Shift the terms to make it a quadratic equation:

3 sin^2x - 2sinx - 1 = 0

Factorise the quadratic equation:

(sinx - 1)(3sinx + 1) = 0

sin x = 1 or sin x = -1/3

Solve for sin x = 1:

From graph of sin x, x = 90 and 270 degrees when sin x = 1.

x = 90, 270 degrees

Solve for sin x = -1/3

Sin x = -1/3

Basic angle = sin inverse (1/3)

= 19.471 degrees

Since sin x < 0, x is in the 3rd or 4th quadrant

x = 180 + 19.471, 360 - 19.471

x = 199.5, 340.5

Hence, x = 90, 199.5, 270, 340.5 degrees

[Sorry if I am wrong :( ]

8 0

4 years ago

A rectangular flower bed has a length of 1/2 yard. The width of the flower bed is 3/4 yard. What is the area of the flower bed?

UkoKoshka [18]

Answer:

The answer is 4 whole 2 by 3 (4 2/3).

Step-by-step explanation:

(3/4) x = 3 1/2

3 x / 4 = 7/2

3 x = 14

x = 14/3 = 4 2/3.

5 0

3 years ago

Find the missing side. round to the nearest tenth

barxatty [35]

So you would use the law of sines so set up the equation sin18/16 = sin72/x (sin 72 being the top angle) and then you cross multiply and solve from there:)
Hope this helps!

3 0

3 years ago

Read 2 more answers

Help with the FIREWORKS question!

liubo4ka [24]

I think the answer is 0.25 seconds later
Hope this helped

8 0

4 years ago

The hockey team is attending a skills competition. Lily has made 85% of her

rosijanka [135]

Answer:

Amelia

Step-by-step explanation:

lily made 85% of her shots

Amelia made 31 out of 36 of her shots

31/36 = 0.86

Amelia made 86% out of her shots

86% > 85%

3 0

3 years ago