Solve the problem.At an altitude of 2700 ft, the engine on a small plane fails. What angle of glide is needed to reach an airport runway that is 4 miles away by land? (Round your answer to the nearest tenth of a degree.)
A. 88.9°
B. 8.3°
C. 7.3°
D. 89.9°
Answer: C
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Determine whether the given equation is an identity.
+ 8 = 
- 4 - 
+ 12
A. Yes B. No
Find the real solutions of the equation.
= 4
A. {12} B. {64} C. {20} D. {16}
Find a quadratic function that models the data.The table shows the population of a city in selected years. Data are in thousands rounded to the nearest hundred. YearPopulation (thousands)1970 78.21975 80.11980 85.31985 92.71990 103.81995 117.8 Let x = 0 correspond to 1970 and let f(x) be the population of the city (in thousands) in year x. Using the point 
as the vertex and and the data from 1995, determine a quadratic function 
that models the data.
A. f(x) = 0.06336x2 + 78.2 B. f(x) = 0.0792x2 + 78.2 C. f(x) = 0.3136x2 - 78.2 D. f(x) = 1.584x2 + 78.2
Factor by grouping.9z2 + 6z - 8
A. (9z + 4)(z - 2) B. (3z - 4)(3z + 2) C. 9z2 + 6z - 8 D. (3z + 4)(3z - 2)