Find a general term an for the geometric sequence.a4 = - 1, a7 =  

A. an = 6  n-1
B. an = 8  n-1
C. an = 8  n-1
D. an =   n-1

Answer: C

Mathematics

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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

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The point P on the unit circle that corresponds to a real number t is given. Find the indicated trigonometric function.?Find cos t.

A. - 
B.
C. - 
D. - 

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Differentiate implicitly to find d2y/dx2.x3 + y3 = 8

A.  
B.
C. - 
D. - 

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