Can someone i don’t understand this! ?

A

Step-by-step explanation:

Let's label what we currently have:

Since the answer choices are asking us to use cosine, we will need to use the cosine formula:

It seems like we don't have the adjacent side yet. However, if we use another angle, we can find out what x is. We know one angle is 35°. Since it is a right triangle, the other angle is 90°. Since all triangles add up to 180°, we know that the other angle is 55°. We CAN use cosine to find x if we use the 55° angle.

Let's label our new areas:

By using the cosine formula, we can now use the two values we have in the equation.

answer: ok

step-by-step explanation: