Two cyclists start from the same location and ride in opposite directions, one riding at 15 mph and the other at 18 mph. If their radio phones have a range of 22 miles, how many minutes will they be able to
communicate?

40 minutes (I think)

Step-by-step explanation:

Calculate the time into minutes

15mph-0.25mpm

18mph-0.3mpm

add them together to find out how far they go combined each minute

0.55

divide 22 by 0.55 to find the total time

40 minutes

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:

step-by-step explanation: yes