The velocity of a sky diver t seconds after jumping is given by  figure 1.png)
. After how many seconds is the velocity 50 ft/s?
(a) 5.0 s
(b) 4.9 s
(c) 8.9 s
(d) 0.2 s
(e) none of these
(b) 4.9 s
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Identify the rules of algebra illustrated from left to right by the following statement.
A. associative property of multiplication; multiplicative inverse property; multiplicative identity property B. commutative property of multiplication; multiplicative inverse property; multiplicative identity property C. associative property of multiplication; multiplicative identity property; multiplicative inverse property D. commutative property of multiplication; multiplicative identity property; multiplicative inverse property E. distributive property; multiplicative identity property; multiplicative inverse property
Graph. Label any intercepts and determine the slope of the line. If the slope is undefined, state this.y = 7
A. y-intercept: (0, 7), m: 0
B. y-intercept: (0, 0), m: 7
C. y-intercept: (0, 0), m: 
D. y-intercept: (7, 0), m: undefined
Perform the indicated operations.(8x3 + 2x2) - (7x2 - 5x -1) - (6x3 + x - 5)
A. 14x3 - 9x2 + 4x - 6 B. 2x3 - 3x2 - 4x + 6 C. 2x3 - 5x2 + 4x + 6 D. 2x3 + 5x2 + 6x - 6
Solve the problem.The half-life of a certain radioactive substance is 20 years. Suppose that at time 
there are 30 g of the substance. Then after t years, the number of grams of the substance remaining will be N(t) = 30(1/2)t/20. How many grams of the substance will remain after 80 years?
A. 0.47 g B. 0.23 g C. 1.88 g D. 0.94 g