Question 745720
"A car is traveling at the speed of 55 mph.You want to write an algebraic expression to show how far the car will travel in a certain number of hours. What will the constant? The Variable?" 
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I think you're right
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The equation will be 
d(x) = 55x
where
d(x) = the distance as a function of time
x = the variable, time in hours
55 = the slope
there is no constant