Find the sum or difference. Write the answer in standard form, a + bi.9i - (-7 - i)
A. -7 + 8i
B. 7 + 10i
C. 7 - 8i
D. -7 - 10i
Answer: B
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Describe the curve represented by the equation. Identify the type of curve and its center (or vertex if it is a parabola).
- 
= 1
A. Ellipse, (-3, -1) B. Parabola, (1, 3) C. Parabola, (3, 1) D. Hyperbola, (1, 3)
Find the expected value.Mr. Cameron is sponsoring an summer concert. He estimates that he will make $300,000 if it does not rain and make $60,000 if it does rain. The weather bureau predicts the chance of rain is 0.34 for the day of the concert. What are Mr. Cameron's expected concert earning?
A. $300,000 B. $360,000 C. $60,000 D. $218,400
The graph of a linear function f is shown. Identify the y-intercept and x-intercept.
A. y-intercept: (0, 2); x-intercept: 
B. y-intercept: (0, 2); x-intercept: 
C. y-intercept: (0, -2); x-intercept: 
D. y-intercept: (0, -2); x-intercept: 
Use the properties of the trigonometric functions to find the exact value of the expression. Do not use a calculator.sin2 50° + cos2 50°
A. 0 B. -1 C. 1 D. 2