Solve the problem.A bridge is built in the shape of a parabolic arch. The bridge arch has a span of 184 feet and a maximum height of 25 feet. Find the height of the arch at 15 feet from its center.
A. 2.7 ft
B. 33.1 ft
C. 0.2 ft
D. 24.3 ft
Answer: D
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Graph the solution set of the system.2x + y ? 4 y - 1 ? 0
A. 
B. 
C. 
D. 
Solve.A carpenter wants to make a semicircular deck by cutting four equal pieces of wood as shown. Measure the angle of one of the pieces. Describe another way to determine the angle measure without using a protractor.
A. 90°; Since two of the pieces form a right angle, one of the pieces measures 1/2(180°), or 90°. B. 40°; Since two of the pieces form a right angle, one of the pieces measures 1/2(80°), or 40°. C. 45°; Since two of the pieces form a right angle, one of the pieces measures 1/2(90°), or 45°. D. 60°; Since two of the pieces form a right angle, one of the pieces measures 1/2(120°), or 60°.
Solve the problem.The hydrogen potential, pH, of a substance is defined by 
where the hydrogen ion concentration, [H+], is measured in moles per liter. Find the hydrogen ion concentration of a solution whose pH is 7.4.
A. 3.98 × 10-8 moles per liter B. 0.86923172 moles per liter C. 2.51 × 107 moles per liter D. -0.8692317 moles per liter
Subtract.-8.4 - 2.2
A. -6.2 B. 10.6 C. -10.6 D. 6.2