Please solve this for me!! its from khan academy

Given:

The given triangle ABC is a right angled triangle.

The length of AC is 4 units.

The measure of ∠B is 20°

We need to determine the length of BC.

Length of BC:

The length of BC can be determined using the trigonometric ratio.

Thus, we have;

From the figure, the side opposite to the angle is AC and adjacent is BC.

Substituting opp = AC and adj = BC, we get;

Substituting AC = 4, we have;

Simplifying, we have;

Thus, the length of BC is 10.99 units.

plants store their excess carbohydrate in the form of starch so that it could be used as energy source later on. the excess carbohydrate is converted into starch in the plastid i.e. chloroplast & this process occurs in the presence of sunlight. it is an insoluble polymer of glucose which gets stored in cell organelles named as amyloplasts. in some plants, starch is also stored in roots and embryos.

the answer is b. 60. each interior angle in 120, so the exterior angle must be 60 in order to add up to 180

step-by-step explanation: