Side DE is the side adjacent to ∠D. Side DF is the hypotenuse of the triangle. Adjacent/hypotenuse is the ratio for cosine; this gives us the equation To solve this, multiply both sides by 55: Answer d; a supplementary angle = 180°, so if that angle = 150°, y would = 30°.

You are watching: Use △def, shown below, to answer the question that follows:  Gabriel determined that his total cost would be represented by 2.5x + 2y – 2. his sister states that the expression should be x + x + 0.5x + y + y – 2. who is correct? explain.
Use △def, shown below, to answer the question that follows: triangle def where angle e is a right a...
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