Find all possible values for each expression. sin^-1 1/2 a. 30° + 180n, 150° + 180n b. 30° + 360n, 150° + 360n c. 60° + 180n, 120° + 180n d. 60° + 360n, 120° + 360n

Option B.

Step-by-step explanation:

The given expression is

It can be written as

We know that sin is positive in first and second quadrant.

For first quadrant,

For second quadrant,

So, the required angles are .

Therefore, the correct option is B.

56.6

step-by-step explanation:

the ratio of the perimeters is equal to the scale.

the ratio of the areas is equal to the square of the scale.

34 / 20 = k

a / 19.6 = k²

substituting:

a / 19.6 = (34 / 20)²

a = 19.6 (34 / 20)²

a ≈ 56.6