Heon and Ami are both travelling by train. Heon's train travels 120 km in 90 minutes. Ami's train travels 375 km. It leaves at 11:25 and arrives at 15:10. Work out the difference, in km/h, between the average speed of their trains.

20 km/h

Step-by-step explanation:

Speed = Distance / Time

Heon Train:

Translate minutes to hours:

90 minutes = 1.5 hours

= 120 / 1.5

= 80 km/h

Ami's Train

Train leaves at 11:25 and arrives at 15:10.

15:10 - 11:25 = 3hours 45 minutes

3 hours 45 minutes in minutes = (60 * 3) + 45 = 225 minutes

225 minutes in hours is = 225/60 = 3.75 hours

Speed of train = 375 / 3.75

= 100 km/h

Difference between average speeds:

= 100 - 80

= 20 km/h

the discriminant is 64 + 4*1*12 = 112

this is prime.

step-by-step explanation:

options a,b,c are the right answer.

step-by-step explanation:

a linear parent function is always represented as y = x

if we write this function in the form of y=mx+c

⇒

or  

now if we plot a graph we will find these characteristics:

1) y intercept of the graph is zero so its a straight line passing through origin.

2) as we can see in both the forms of function written, values of x and y may be either positive or negative for the positive slope means points on the graph are either in first quadrant or in third one.

3) it's slope is one.