Answer:
(f+g)(x) = 5x + 3
Step-by-step explanation:
f(x) = 2x - 6 and g(x) = 3x + 9, find (f+g)(x)
(f+g)(x) = f + g = (2x - 6) + (3x + 9) = 5x + 3
(f+g)(x) = f + g = 5x + 3
Solving proportions is simply a matter of stating the ratios<span> as fractions, setting the two fractions equal to each other, cross-multiplying, and solving the resulting equation. You'll probably start out by just solving proportions, like this: </span>Find the unknown value<span> in the proportion: 2 : x = 3 : 9</span>
D(x)=62.5x+15 x is how far he goes when he travels 62.5 miles per hour. Since he is already 15 miles north of the city we add that in as our "starting" distance. On a graph, this would be the y-intercept and the speed would serve as the slope. This is given as a linear relationship.