An airplane is sighted at the same time by two ground observers who are 4 miles apart and both directly west of the airplane. They report the angles of elevation as 12° and 21°. How high is the airplane?

Complete the identity.sin (A + B) + sin (A – B) = ?

Solve the right triangle using the information given. Round answers to two decimal places, if necessary.a = 8, b = 5; Find c and β.

In triangle ABC, if a = 11, b = 14, and c = 15, find the measure of the largest angle.

Find sin , given that cos θ = – and θ terminates in 180° < θ < 270°.

Two sides and an angle are given. Determine the number of triangles the given information results in. For triangle ABC, if a = 7, b = 9, and B = 49°, the following is true.

Solve the right triangle using the information given. Round answers to two decimal places, if necessary.a = 4, b = 6; Find c and β.

Write the expression

According to the superstition story Mr. Wise relayed in Chapter 14 lecture, what should you NOT do while onstage under a fly rail system, lest a batten may be released onto your head? _______

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