Decide whether the graph opens up or opens down.f(x) = -(x + 3)2 + 8
A. opens down
B. opens up
Answer: A
Mathematics
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Write the fraction in simplest form.
A. 
B. 
C. 
D. 
Mathematics
Solve the problem.A rock falls from a tower that is 480 feet high. As it is falling, its height is given by the formula 
How many seconds will it take for the rock to hit the ground 
Round to the nearest tenth, if necessary.
A. 21.9 sec B. 21.5 sec C. 14,400 sec D. 5.5 sec
Mathematics
Solve the system of equations by substitution.
A. (7, 0) B. (0, -7) C. (1, -8) D. no solution
Mathematics
Solve the problem.The temperature at 5:00 was -3° C. Four hours later, it was -14° C. What was the change in temperature?
A. -17° C B. 11° C C. 17° C D. -11° C
Mathematics