Use the graph to answer the question. The graph shows the relationship between the time and the speed of a train that has already left the station.
Train Speed
Speed (miles per hour)
100-
90-
80+
70
60-7
50+
40
30
20
10
0
10 20 30 40 50 60 70 80 90 100
Time (minutes)
During which time period was the train traveling at a constant speed?
O B. between 20 and 40 minutes
O A between 0 and 20 minutes
Oc between 40 and 60 minutes
O D. between 60 and 80 minutes

or

step-by-step explanation:

we need to solve for 'x' the following equation:  

we have that:

⇒

⇒ ⇒

factorizing, we get that:

  ⇒

then, the solutions are: or

nothing extraneous has been found!

1. x> -5

2. x< 8

step-by-step explanation:

1. 2x> -10

divide by 2 from both sides of equation.

2x/2> -10/2

simplify, to find the answer.

-10/2=-5

x> -5 is the correct answer.

2. 3x< 24

divide by 3 from both sides of equation.

3x/3< 24/3

simplify, to find the answer.

24/3=8

x< 8 is the correct answer.

i hope this you, and have a wonderful day!

step-by-step explanation:

left be aligning the decimal points is required to not required see the number of digits to the right