Use the formula for 
to solve.A church has 7 bells in its bell tower. Before each church service 5 bells are rung in sequence. No bell is rung more than once. How many sequences are there?
A. 84
B. 21
C. 2520
D. 42
Answer: C
Mathematics
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Classify the following as the equation of a parabola, a circle, an ellipse, or a hyperbola.4x2 + 16y2 - 64 = 0
A. Circle B. Hyperbola C. Ellipse D. Parabola
Mathematics
Multiply and simplify.
? 
A. 
B. 
C. 
D. 
Mathematics
Write the system in the form 
Then solve the linear system by computing 
with a calculator. Round numbers to the nearest tenth, as necessary.1.6x + 1.6y - 4.5z = 2.83.9x - 5.9y + 0.3z = -3.92.5x + 4.3y + 5.9z = 8.5
A. (0.9, 1.3, 0.1) B. (3.6, 5.0, 0.6) C. (0.4, 0.6, 0.1) D. (1.8, 2.5, 0.3)
Mathematics
Determine if the sequence is geometric. If the sequence is geometric, find the common ratio.3, 12, 48, 192, 768, . . .
A. no
B. yes, 
C. yes, -4
D. yes, 4
Mathematics