Answer:

Step-by-step explanation:
Given: expressions
To find: expression that denotes a rational number
Solution:
A number of the form
where p and q are integers and
is said to be a rational number.
Sum of a rational and irrational number is irrational.
In
,
is a rational number and
is an irrational number
So,
is not a rational number.
In
,
is an irrational number and 4 is a rational number
So,
is not a rational number.
In
,
is a rational number
So,
is a rational number
In
,
is a rational number and
is an irrational number
So,
is not a rational number.
Answer:
60km per hour.
Step-by-step explanation:
Divide 300km by 5hrs to find the distance traveled in an hour.


A possible answer for x would be 18
Answer:
The mechanic who worked 5 hours charged $115 per hour, the one who worked 15 hours charged $120 per hour.
Step-by-step explanation:
x = rate of mechanic who worked 5 hours
y = rate of mechanic who worked 15 hours
Then
x + y = 235
5x + 15y = 2375
Just solve these 2 equations above for x and y.
x + y = 235 ⇒ x = 235 - y
Substitute into second equation to find y.
5(235 - y) + 15y = 2375
1175 - 5y + 15y = 2375
10y = 1200
y = 1200/10 = 120
x = 235 - y = 235 - 120 = 115