Solve the problem.The intensity of a radio signal from a radio station varies inversely as the square of the distance from the station. If the intensity is 8000 units at a distance of 2 miles, what will it be at a distance of 13 miles?
A. 215 units
B. 172 units
C. 153 units
D. 189 units
Answer: D
Mathematics
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Use the half-angle formulas to simplify the given expression.
A. 
cos 2x
B. 3 cos 2x
C. 6 cos 2x
D. 3
cos 2x
Mathematics
Decide if the given number is a solution to the given equation.
= 
; - 40
A. Yes B. No
Mathematics
Solve the problem.Ray's gross pay is $320.40 a week. $46 is withheld for federal income tax, $24.06 for FICA tax, and $11.21 for other deductions. How much of his pay is left?
A. $81.27 B. $239.13 C. $401.67 D. $229.13
Mathematics
Solve the formula for the specified variable.I = 
for n
A. n = 
B. n = 
C. n = IR(Ir - E)
D. n = 
Mathematics