A 150-pound person uses 5.1 calories per minute when walking at a speed of 4 mph. how long must a person walk at this speed to use at least 180 calories?
a person must walk for at least
in order to use at least 180 calories.
(round up to the nearest minute.)

Let 't' represent the time of the walk in minutes.

5.1*t = 220

t = 43.14 min

The person needs to walk at least 43.14 minutes to but at least 220 calories.

what does muffins have to do with anything?

step-by-step explanation:

the direct variation says that:

then the equation is of the form is given by:

            where k is the constant variation.

from the given table:

consider any value of x and m(x)=y

x = 2 and m(x)=y = 3

substitute these value in [1]; we have;

divide both sides by 2 we get;

⇒

check:

put x = -1 and m(x) = -1.5

substitute in the equation:

-1.5 = -1.5                   true

therefore, the function m(x) represents a direct variation

graph of this function as shown below: