Solve the problem.Suppose all items in an ice cream truck cost $0.80 per item. (a) Fill in the table with the correct response for the cost f(x) of purchasing x items. (b). Write the linear function that gives a rule for finding the cost. 
A.
(a)  | (b) f(x) = 0.80x + 0.80 |
B. None of these
C.
(a)  | (b) f(x) = 0.80x |
D.
(a)  | (b) f(x) = 0.80 |
Answer: C
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Decide whether the figure is convex or not convex.
A. Not convex B. Convex
Graph.
- 
= 1
A. 
B. 
C. 
D. 
Solve the problem.In 1838, the German mathematician and astronomer Friedrich Wilhelm Bessel was the first person to calculate the distance to a star other than the Sun. He accomplished this by first determining the parallax of the star, 61 Cygni, at 0.314 arc seconds (Parallax is the change in position of the star measured against background stars as Earth orbits the Sun. See illustration.) If the distance from Earth to the Sun is about 150,000,000 km and ? = 0.314 seconds = 
minutes = 
degrees, determine the distance d from Earth to 61 Cygni using Bessel's figures. Express
the answer in scientific notation. 
A. 9.85 × 1013 km
B. 1.05 × 1014 km
C. 1.97 × 1014 km
D. 2.28 × 1013 km
Write an equation of the line through the given point with the given slope. Write the equation in slope-intercept form.(4, 3); slope: - 
A. y = - 
x + 
B. y = - 
x - 
C. y = - 
x + 
D. y = - 
x + 