Solve.A bridge constructed over a river has a supporting arch in the shape of a parabola. The length of the road over the parabolic arch is 300 feet and the maximum height of the arch is 126 feet. Write the equation of the arch.
A. y = x2 + 126
B. y = 
x2 + 126
C. y = -x2 + 126
D. y = - 
x2 + 126
Answer: D
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Identify the number as prime, composite, or neither.429
A. Composite B. Neither C. Prime
Solve the problem.Using data from 2010-2012, the annual number of cars sold at a certain dealership can be modeled by the formula 
where y is the number of cars, in thousands, sold x years after 2010. According to this formula, in which years will the number of cars sold exceed 37 thousand?
A. Years after 2017 B. Years after 2023 C. Years after 2021 D. Years after 2019
Solve the problem.Prices in an economy with a 12% annual inflation rate can be modeled by P = pert, where r is the inflation rate, t is the time in years, and p is the current price. How long will it take for prices in the economy to double at a 12% annual inflation rate?
A. 23.45 years B. 6.78 years C. 9.16 years D. 5.78 years
Solve the equation.
+ 
= 
+ 
A. {-4} B. {-12} C. {4} D. {3}