Solve the problem.The intensity I of light varies inversely as the square of the distance D from the source. If the intensity of illumination on a screen 5 ft from a light is 4 foot-candles, find the intensity on a screen 20 ft from the light.
A. 
foot-candle
B. 1
foot-candles
C. 
foot-candle
D. 2 foot-candles
Answer: C
Mathematics
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Determine whether the given function satisfies a Laplace equation.f(x, y) = e3ysin 3x
A. Yes B. No
Mathematics
Use the rules for exponents to rewrite the expression and then evaluate the new expression. (2-2)0
A. 1
B. 
C. 0
D. -4
Mathematics
Determine whether the ordered pair is a solution of the system of equations. Remember to use alphabetical order of variables.(5, -2);5a+ 4b=1715a+ 12b=51
A. Yes B. No
Mathematics
Solve the problem. Round to two decimal places unless otherwise indicated.Suppose the cost per ton, y, to build an oil platform of x thousand tons is approximated by y = 
. What is the cost per ton for x = 20?
A. $3125.00 B. $3000.00 C. $431.03 D. $25.00
Mathematics