If x1 is the number of cars taking the ABD route and x2 is the number of cars taking the ACT route, write a linear expression for the travel time of a car taking the ABD route. Do the same for the ADD route.

The travel time for the car = Distance(Route-ABD)/Velocity of the car

t = d/v, where t is the travel time of the car, d is the distance traveled by the car along ABD, v is the velocity of the car.

For ADD route, ADD distance not mentioned in the question.

Notwithstanding, the travel time is given as :

t = Distance (ADD)/v

Step-by-step explanation:

The velocity is a physical quantity, which is defined as the rate of change of displacement with time.

That is, velocity = Displacement/time.

OR

Velocity(or speed) = Distance covered/traveled time.

The car is the question above traveled a distance(say d-meters) in the given route(ABD). It covered the distance in time, t(secs) with a velocity of v(m/s).

From the equation for velocity

v = d/t.

Making t the subject of formula,

travel time, t = d/v

walter needs to make at least 5 more cookies but no more than 40. 5 ≥ x ≥ 40;

step-by-step explanation:

walter has to make a minimum of 20 cookies. he already has 15 cookies made, so he must make 5 more to meet the minimum.

the maximum amount of cookies he can make is 55. he already has 15, so he has to make no more than 40 more cookies to meet the maximum.