Solve the variation 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 3 foot-candles, find the intensity on a screen 15 ft from the light.
A. 1
foot-candles
B. 2 foot-candles
C. 
foot-candle
D. 
foot-candle
Answer: C
Mathematics
You might also like to view...
Solve the equation.-1(z - 4) = 18
A. 22 B. 14 C. -22 D. -14
Mathematics
Solve.x2 - 9x + 20 > 0
A. (5, ?) B. (4, 5) C. (-?, 4) ? (5, ?) D. (-?, 4)
Mathematics
Write the number in expanded form.92,745
A. 9 ten thousands + 2 thousands + 7 hundreds + 4 tens + 5 ones = 90,000 + 2000 + 700 + 40 + 5 B. 92,745 ten thousands = 92,745 C. 9 thousands + 2 hundreds + 7 tens + 45 ones = 9000 + 200 + 70 + 45 D. 5 ten thousands + 4 thousands + 7 hundreds + 2 tens + 9 ones = 50,000 + 4000 + 700 + 20 + 9
Mathematics
Factor by grouping.x3 + 6x2 - 10x - 60
A. (x + 6)(x3 - 10x) B. (x + 6)(x2 - 10) C. (x - 6)(x2 - 10) D. (x2 + 6)(x - 10)
Mathematics