Tell whether a linear model or a quadratic model is appropriate for the data. If a quadratic model is appropriate, then decide also whether the lead coefficient should be positive or negative.The height of a ball thrown from the ground, as a function of time.
A. Quadratic; leading coefficient positive
B. Linear
C. Quadratic; leading coefficient negative
Answer: C
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Find the domain and range and describe the level curves for the function f(x,y).f(x, y) = 
A. Domain: all points in the xy-plane; range: all real numbers; level curves: parabolas 
B. Domain: all points in the xy-plane excluding x = 0; range: real numbers z ? 0; level curves: parabolas 
C. Domain: all points in the xy-plane; range: real numbers z ? 0; level curves: parabolas 
D. Domain: all points in the xy-plane excluding x = 0; range: all real numbers; level curves: parabolas 
Provide an appropriate response.List all positive integer pairs that have a product of 30.
A. 3, 10; 5, 6 B. 1, 30 C. 1, 30; 2, 15; 3, 10; 5, 6 D. 2, 15; 3, 10; 5, 6
Write an expression in terms of the given variable(s) that represents the indicated quantity.Mark has half as many stickers as Derek. If Derek has d stickers and Mark m stickers, and Derek gives Mark 
stickers, how many stickers does each have in terms of d?
A. Derek: 
+ 10; Mark: d - 10
B. Derek: d - 10; Mark: 
+ 10
C. Derek: 
- 10; Mark: d + 10
D. Derek: d + 10; Mark: 
- 10
Evaluate.-2.2 + (-7.7)
A. -9.9 B. -5.5 C. 5.5 D. 9.9