Solve the problem.The intensity I of light varies inversely with 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. 1
foot-candles
B. 
foot-candle
C. 
foot-candle
D. 2 foot-candles
Answer: B
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Find an equation for the tangent to the curve at the given point.f(x) = 10
- x + 7, (100, 7)
A. y = 
x - 57
B. y = 7
C. y = - 
x + 7
D. y = - 
x + 57
Calculate using the rules for order of operations.23 - [4(32 - 23 - 7)]2
A. -568 B. -433 C. 200 D. -136
Simplify the polynomial by adding or subtracting, as indicated. Express your answer as a single polynomial in standard form.(2x6 - 20x5 + 16) - (7x6 - 16x5 - 7)
A. -5x6 - 13x5 + 9 B. 14x11 C. -5x6 - 4x5 + 9 D. -5x6 - 4x5 + 23
Determine whether the function is one-to-one. If it is one-to-one find an equation or a set of ordered pairs that defines the inverse function of the given function.f = {(0, 0), (1, 1), (-2, 9)}
A. not one-to-one
B. one-to-one; f-1 = {(0, 0), (1, -2), (9, 1)}
C. one-to-one; f-1 = {(0, 0), (1, 1), (9, -2)}
D. one-to-one; f-1 = 