Question

Can someone help I don’t understand this!?

Answer 1

Answer:

to do this you need to know that cos= adjacent/hypotenous.

Therefore your answer would be cos55=12/x

Step-by-step explanation:

Answer 2

Answer:

A

Step-by-step explanation:

Let's label what we currently have:

$Hypotenuse = x$

$Opposite = 12$

$Adjacent = ?$

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

$cos=\frac{adjacent}{hypotenuse}$

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:

$Hypotenuse=x$

$Opposite=?$

$Adjacent=12$

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

$cos 55=\frac{12}{x}$