A boy rides away from home in an automobile at the rate of 28 km/h and walks back at the rate of 4 km/h. The round trip is x km. Write and simplify an expression that will represent the total time, in hours, the boy travelled. (distance=speed *time)

Step-by-step explanation:

Then, the total time, which is 2 hours, is equal to x plus 7x, or 8x. So the amount of time he spends in the automobile is x=1/4 hour. The distance he travels in 1/4 hour at 28 mph is 7 miles.

pls mark brainliest

the formula of a slope:

from a table we have

substitute:

the slope of f(x) is -1.

the graph of funcfion g(x) is a horizontal line. the slope of a horizontal line is equal 0. therefore the slope of g(x) is 0.

-1 < 0

a

step-by-step explanation: