Solve the problem.An airplane flying faster than the speed of sound creates sound waves that form a cone. If ? is the vertex angle of the cone and m is the Mach number for the speed of the plane, then 
Find the Mach number to the nearest tenth if 
A. 1.7
B. 1.4
C. 2.6
D. 2.4
Answer: C
Mathematics
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Determine whether the lines through each pair of points are perpendicular.(7, 1) and (11, -7); (-6, -5) and (-10, -3)
A. perpendicular B. not perpendicular
Mathematics
Simplify the expression. Assume that all variables are positive when they appear.
A. 
B. 
C. 
D. 
Mathematics
Solve.Two 6-sided dice are rolled. What is the probability that the sum of the two numbers on the dice will be 4?
A. 
B. 
C. 3
D. 
Mathematics
Solve.How many different three-number "combinations" are possible on a combination lock having 29 numbers on its dial?
A. 21,924 B. 21,112 C. 10,962 D. 42,224
Mathematics