Answer:
Its a
Step-by-step explanation:
Answer:
20(E)
Step-by-step explanation:
Printing press R, S and T are working together at their respective constant rate.
They can do a job for 4 hours.
Let r, s and t be the time for printing press R, S and T to complete the job alone at their respective constant rate.
Rate of printing press R = 1/r
Rate of printing press S = 1/s
Rate of printing press T = 1/t
Rate = job / time
R + S + T = 4
1/r + 1/s + 1/t = 1/4
S + T = 5
1/s + 1/t = 1/5
Substitute 1/s + 1/t = 1/5 in the equation 1/r + 1/s + 1/t = 1/4
1/r + 1/5 = 1/4
1/r = 1/4 - 1/5
1/r = (5 - 4)/ 20
1/r = 1/20
r = 20 hours
It takes the printing press R 20 hours to complete the job alone
The teachers will need three busses, each fitting 99 students.
ANSWER
(-2,4] and [7,∞).
EXPLANATION
The domain refers to the interval on which the function is defined.
In the case of the graph, the domain refers to all the x-values for which the graph exists.
The graph is defined for x-values greater than 2 but less than or equal to 4 and
x-values greater than or equal to 7.
In interval notation, we have:
(-2,4] and [7,∞).
The second choice is correct:
3/7 is the answer for this problem