Determine the equation that expresses the statement.
F is directly proportional to x
Symbols a, b, c, d are constants.
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(e) F = ax
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The gas mileage M that your car gets depends on its age t.
?
A: Explain in practical terms the meaning of 
.
B: As your care ages, gas mileage decreases. Would be positive or negative?
C: Your mechanic tells you that if you use his super gasoline additive, your gas mileage will improve over time. Assuming the additive works, would be positive or negative once you start using the additive?
What will be an ideal response?
Determine an appropriate domain of the function. Identify the independent and dependent variables.A weather balloon of radius r (in meters) is filled with air. The volume V of the balloon is given by the function 
. Assume the balloon can hold up to 16 m3 of air.
A. D = [0, 16]
The independent variable is r.
The dependent variable is V.
B. D = 
The independent variable is V.
The dependent variable is r.
C. D = 
The independent variable is r.
The dependent variable is V.
D. D = 
The independent variable is r.
The dependent variable is V.
Solve the problem.Given the velocity and initial position of a body moving along a coordinate line at time t, find the body's position at time t.v = -18t + 9, s(0) = 13
A. s = 9t2 + 9t - 13 B. s = - 18t2 + 9t + 13 C. s = - 9t2 + 9t + 13 D. s = - 9t2 + 9t - 13
Find parametric equations for the line described below.The line through the point P(-3, 3, -3) and perpendicular to the plane 
A. x = -7t - 3, y = 3t + 3, z = -3 B. x = 3t + 3, y = 7t - 3, z = 5t + 3 C. x = -3t + 3, y = -7t - 3, z = -5t + 3 D. x = 3t - 3, y = 7t + 3, z = 5t - 3