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 
find the intensity on a screen 20 ft from the light.
A. 8 foot-candles
B. 
foot-candle
C. 
foot-candle
D. 2 foot-candles
Answer: B
Mathematics
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Estimate using front-end rounding:
?
A. 400 B. 390 C. 380 D. 410
Mathematics
Graph the system of linear inequalities.y ? -x + 2y ? 2
A. 
B. 
C. 
D. 
Mathematics
The point P on the circle x2 + y2 = r2 that is also on the terminal side of an angle ? in standard position is given. Find the indicated trigonometric function.(5, 12)Find cos ?.
A. - 
B. 
C. - 
D. 
Mathematics
Find an explicit description of the null space of matrix A by listing vectors that span the null space.A = 
A. 
, 
, 
, 
B. 
, 
C. 
, 
, 
D. 
, 
, 
Mathematics