The line graph shows the recorded hourly temperatures in degrees Fahrenheit at an airport. 
At what time was the temperature its lowest?
A. 1 p.m.
B. 6 p.m.
C. 9 a.m.
D. 4 p.m.
Answer: C
Mathematics
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Solve the problem.A formula for calculating the distance, d, that can be seen from an airplane to the horizon is 
where x is the altitude of the plane in feet. Find d when the altitude is 21,710 feet. Round your answer to the nearest hundredth.
A. 179.76 feet B. 279.76 feet C. 13,243.1 feet D. 148.56 feet
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Simplify the radical expression. Assume all variables represent positive real numbers.
A. ±3 B. 9 C. 5 D. -3
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Use properties of multiplication to multiply.0 ? 5
A. 1 B. 50 C. 0 D. 5
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Determine the constant term that must be added to the expression to make it a perfect square.x2 - 
x
A. - 
B. - 
C. 
D. 
Mathematics