Determine the coordinates of the focus and the equation of the directrix of the parabola.y2 = 40x
A. F(10, 0), x = 10
B. F(0, 10), y = -10
C. F(10, 0), x = -10
D. F(10, 10), x = 10
Answer: C
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Solve the problem. Round your answer to the nearest tenth unless otherwise indicated.Last week, Brian earned $165 while Lucy earned $559. $165 is what percentage of $559?
A. 39.4% B. 29.3% C. 70.5% D. 29.5%
Which of the following physical situations would best be modeled by the graph?
A. The length y of a shadow cast by a tree between sunrise and noon, where t is the angle of elevation of the sun.
B. The length y of a shadow cast by a horizontal flagpole on a vertical wall between sunrise and noon, where t is the angle shown.
C. The number of hours y of sunlight during month t, where t = 1 corresponds to January.
D. The monthly average ocean temperature y in degrees Fahrenheit during month t, where t = 1 corresponds to January.
Perform the indicated operation. Assume that all variables are nonnegative.(
+ 
)(
- 
)
A. a + b
B. a + 2
- b
C. a - b
D. a - 2
+ b
Find the mistake, then find the correct answer.Solve for x: 3x2 - 7x + 1 = 0line 1 x = 
line 2 x = 
line 3 x = 
line 4 x = Not a real number because 
is not a real number.
What will be an ideal response?