There are 5 black keys in one piano octave. How many different 4-keys chords can be played on the synthesizer of 2 octaves, using only black keys?
a. 210
b. 140,792,940,288,000
c. 151,200
d. 840
a. 210
Mathematics
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Determine whether the statement is true or false. If you square any term of the Lucas sequence and subtract 5 you will obtain the product of the 2 terms either side of the term squared.
A. True B. False
Mathematics
Solve the problem.Assume that the volume of Earth is5 × 1014 cubic meters and the volume of a bacterium is2.5 × 10-16 cubic meters. If Earth could be filled with bacteria, how many would it contain?
A. 5.0 × 1031 bacteria B. 2.0 × 10-30 bacteria C. 2.0 × 1030 bacteria D. 5.0 × 10-31 bacteria
Mathematics
Solve the equation for the interval [0, 2?).csc5x - 4 csc x = 0
A. x = 
, 
, 
, 
B. x = 
, 
, 
, 
C. x = 
, 
, 
, 
D. x = 
, 
, 
, 
Mathematics
Solve the equation.6 = 
- 8
A. 5 B. 129 C. 126 D. 4
Mathematics