Sin400°=

1. sin40°
2. -sin40°
3. sin(-40)°

sin(40°)

Step-by-step explanation:

Trigonometric functions such as sine, cosine, tangent whose short forms are sin, cos, tan respectively are repetitive functions which repeat itself after every integral multiple of 2π radian or 360°. It means if you add or subtract 360° from any input of  trigonometric function the output of the function won't change.

It means sin(θ) = sin(θ - n×360°) = sin(θ + n×360°)

similarly cos(θ) = cos(θ - n×360°) = cos(θ + n×360°)

and tan(θ) = tan(θ - n×360°) = tan(θ + n×360°)

where n is an integer.

So, by this sin(400°) = sin(400° - 360°) = sin(40°)

walter needs to make at least 5 more cookies but no more than 40. 5 ≥ x ≥ 40;

step-by-step explanation:

walter has to make a minimum of 20 cookies. he already has 15 cookies made, so he must make 5 more to meet the minimum.

the maximum amount of cookies he can make is 55. he already has 15, so he has to make no more than 40 more cookies to meet the maximum.