Perform the indicated operation. Express the solution in scientific notation.(9 × 109)2
A. 81 × 1019
B. 8.1 × 1019
C. 81 × 1018
D. 8.1 × 1018
Answer: B
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Solve the problem.A team of engineers is testing an experimental high-voltage fuel cell with a potential application as an emergency back-up power supply in cell phone transmission towers. Unfortunately, the voltage of the prototype cell drops with time according to the equation 
where V is in volts and t is the time of operation in hours. The cell provides useful power as long as the voltage remains above 5.1 volts. Use Newton's method to find the useful working time of the cell to the nearest tenth of an hour (that is, solve V(t) = 5.1 volts). Use t = 7 hours as your initial guess and show all your work.
What will be an ideal response?
Solve the problem.An arch in the form of a semiellipse is 52 ft wide at the base and has a height of 20 ft. How wide is the arch at a height of 12 ft above the base?
A. 17.7 ft B. 20.8 ft C. 35.5 ft D. 41.6 ft
Find the vertex, focus, and directrix of the parabola x² = 7y.
 figure 1.png)
Choose the graph that matches the equation. -3x + 12y = 18
A. 
B. 
C. 
D. 