Answer:
(B) 9/20
Step-by-step explanation:
The fastest machine can do 1/4 of the job in 1 hour. The second-fastest machine can do 1/5 of the job in 1 hour. Together, these two machines can do ...
(1/4) +(1/5) = (5+4)/(5·4) = 9/20
of the job in 1 hour.
9/20 of the job can be done in 1 hour by two of the machines.
Solution
x≤−2 and x<−5
number line for x≤−2
-2,-3,-4.....-n
<---−10-------−9------−8------−7------−6------−5-----−4-------−3------−2
number line for x<−5
-6,-7,-8.....-n
<---−10-------−9------−8------−7------−6
27 is right
28 is right also
Good Job and Good Luck!
Answer:
hello :
f(x) = 13/ (x-3)
f(x) exist : x - 3 ≠ 0
x - 3 = 0 : x = 3
the domain of the function : f is D = ]-∞:3[ U] 3;+∞[