Solve the problem.On a cloudy day, Sun Woo needed to know the height of a window in a building. Sun Woo positioned a mirror on the ground between himself and the building so that when he looked in the mirror, he saw the window. If the mirror was 18.49 cm from his feet and 32.14 m from the base of the building and Sun Woo's eye was 1.79 m above the ground, how high up on the building was the window located? Round to the nearest unit.
A. 3 m
B. 103 m
C. 1 m
D. 311 m
Answer: D
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Find both the parametric and the vector equation of the line.The line through (0, 1, 0) in the direction of the vector v = (3, 0, -1)
A. x = 3, y = t, z = -1; r = (3, 0, -1) + t(0, 1, 0) B. x = 3, y = t, z = -1; r = (0, 1, 0) + t(3, 0, -1) C. x = 3t, y = 1, z = -t; r = (0, 1, 0) + t(3, 0, -1) D. x = 3t, y = 1, z = -t; r = (3, 0, -1) + t(0, 1, 0)
Use a graphing calculator to approximate the solutions of the system. Give answers to the nearest tenth.
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What will be an ideal response?
Solve the problem.A searchlight is shaped like a parabola. If the light source is located 2 feet from the base along the axis of symmetry and the opening is 14 feet across, how deep should the searchlight be?
A. 24.5 ft B. 0.1 ft C. 12.3 ft D. 6.1 ft
Solve the problem.Strontium 90 decays at a constant rate of 2.44% per year. Therefore, the equation for the amount P of strontium 90 after t years is P = P0 e-0.0244t. How long will it take for 15 grams of strontium to decay to 5 grams? Round answer to 2 decimal places.
A. 4.50 years B. 450.25 years C. 45.03 years. D. 40.50 years