How many hours would it take fran to swim 0.8 miles upstream

Fran's upstream speed (against the current):

       2.7 km/hr - 0.8 km/hr = 1.9 km/hr

Now we can answer each question by manipulating the distance formula to come up with our expression for calculating time:

   rate x time = distance

            time = distance / rate      

   Fran's upstream time = 9 / 1.9 = 4.7 hrs

the system of inequalities is

step-by-step explanation:

step 1

find the equation of the dashed line

we have the points

(0,0) and (3,1)

the line passes through the origin, so, is a direct variation

find the slope

the equation of the dashed line is

the solution of the inequality a s the shaded area above the dashed line

therefore

the equation of the inequality a is

step 2

find the equation of the solid line

we have the points

(4,0) and (0,4)

find the slope

the equation of the solid line is

the solution of the inequality b s the shaded area below the solid line

therefore

the equation of the inequality b is

step 3

the system of inequalities is