Tyler and pearl went on a 20km bike ride that lasted for 3 hours. because of steep hills or the trail, they walked for most of the trip. their walking speed was 4km/hr. their riding speed was 12km/hr. how much time did they spend walking?

1 hour

Step-by-step explanation:

Let the distance they walked be in time and the distance they walked be in time ,then

Walking speed=

Riding speed=

Also the total time taken=3 hours

∴...(1)

Since the total distance= 20 km

∴

Thus, the they spent 1 hour time in walking.

your answer would be 12

b: |12 – x| ≤ 0.25

step-by-step explanation:      

let x be the possible lengths in inches, of the ribbons jaime cut.

we have been given that jaime is cutting strips of ribbon for a project. he tries to cut each piece to be 12 inches long, but sometimes he cuts it too long or too short by as much as 0.25 inch.  

we can represent this information in an inequality as:

by the definition of absolute value function we will get,

upon combining our inequalities we will get,

therefore, the inequality   describes all the possible lengths (x), in inches, of the ribbons jaime cut.

step-by-step explanation: