Answer:
17/18
Step-by-step explanation:
- 2
9
–
- 7
6
=
-2 × 2
9 × 2
–
-7 × 3
6 × 3
=
-4
18
–
-21
18
=
-4 – -21
18
=
17
18
Answer:
80 and 90 mph
Step-by-step explanation:
Given that A and B have a distance of 1029 miles between them. Two trains each start from A and B and move towards each other.
Let the speed of I train be s
Then speed of second train = s+10 (since 10 greater than speed of I train)
Relative speed = s+s+10 = 2s+10
In 5 hours they travelled together a distance of 1020-170 =850 miles
Distance travelled = 850 miles
Relative speed = 2s+10
Time taken = 5 hours
Since distance = time x speed
we have
5(2s+10) =850
2s+10 =170
s = 80
Speed of the trains are 80mph and 90 mph
Answer:
27
Step-by-step explanation:
f(x) is the same as y
if x=5 then you will multiply 5 by 4 which will give you 20
20 + 7 = 27
We have 3x+50=6x-10 subtracting 3x from both sides we get 50=3x-10. Now we add 10 to both sides to get 60=3x. Dividing both sides by 3 we get x=20.