Write the number as a product of a real number and i. Simplify the radical expression.
A. -7i
B. i
C. ± 7
D. 7i
Answer: D
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Solve the problem.Sales of cassette tapes at a local music store decreased approximately linearly from 1,400,000 cassettes in 1988 to 11,000 cassettes in 1993. Find the rate of change of sales per year.
A. 277,800 cassettes per year B. -2580 cassettes per year C. -277,800 cassettes per year D. -27,780 cassettes per year
Solve the problem.A rocket lifts off the surface of Earth with a constant acceleration of 30 m/sec2. How fast will the rocket be going 2.5 minutes later?
A. 37.5 m/sec B. 75 m/sec C. 187.5 m/sec D. -75 m/sec
Simplify. 
A. 
x
B. 
C. 
D. 
The calculator graphs shows the x-values of the x-intercepts of the graph of the polynomial in the equation. Use the graphs to solve the equation.4x2 -20x +21 = 0
A. {1.5, 3.5} B. {-29, 21} C. {-3.5, -1.5} D. {6, 14}