Let x be the number of 20 ton cars
Then,
380<{15(22-x)+20x}<400
380<{330-15x+20x}<400
380<{330+5x}<400
Subtract 330 on both sides
50<5x<70
Divide both sides by 5;
10<x<14
Therefore, the range of 20 tonne cars is between 10 and 14 cars.
Hey there!
To convert the repeating nonterminating decimal into a fraction, you would ROUND.
Round 0.1515 into 0.2
Now, make a fraction.
2/10, which can be simplified into 1/5.
I hope this helps!
Answer:

Step-by-step explanation:
First, we gather the data:
The model is a single
landing strip with 
This based on the assumption that service times are exponential.
Then, we must find the maximum rate such that 
Using the
table, we find that:

if and only if

=
Answer:
d.
Step-by-step explanation:
Answer:
24 is the answer ok 21/7
is 3 and multiply it with 8 that is 24
2]
q = -3