Question

solve for x. which function should you use? a. sine b. cosine c. tangent

Explanation:

Step1: Recall trigonometric ratios

In a right - triangle, \(\cos\theta=\frac{\text{adjacent}}{\text{hypotenuse}}\). Here, \(\theta = 20^{\circ}\), the adjacent side to the \(20^{\circ}\) angle is \(4\) and the hypotenuse is \(x\).

Answer:

B. cosine