Answer to Question #55821 in Calculus for Oliver Swanick

Question

7: Describe the Nature of the roots for this equation.
2x^2 + 5x – 7 = 0

A: one real, double root
B: Two complex roots.
C: Two real, rational roots
D: Two real, irrational roots.

8: Describe the nature of the roots for this equation.
x^2 -2x + 1 = 0

A: Two complex roots
B: One real, double root
C: Two real, rational roots
D: Two real, irrational roots

9: x^2 – 4x + 85 = 0

A: {2 + 19i, 2 – 19i}
B: {2 + 9i, 2 – 9i}
C: {7 +3i, 7 - 3i}
D: {3 + 7i, 3 – 7i}

10: A toy company has determined that the revenue generated by a particular toy is modeled by the following equation: r(x) 11x -0.025x^2

The variable x is measured in thousands of toys produced, and r(x) is measured in thousands of dollars. What is the maximum revenue the company can earn with this toy?

Give the answer in dollars.

Answer: